DAYS 1-5 (SEPTEMBER 20-24)

The final two full summer days and one mostly summer day won’t have a lot of summer feel to them as we are now in a cooler pattern. We felt that cooler air arrive yesterday after a couple warmer days prior. Today’s an unsettled but not totally washed out day. Dry air does the chomp-down on rain as it tries to push in from the west in response to a disturbance moving in ahead of a frontal boundary, but while many of the model precipitation depictions showed a wash-out by late morning on, we won’t really see a whole lot of steady rainfall until the system has moved about half way through our region and is entering its back half, and that will mainly occur late this afternoon and early this evening, and rainfall amounts should and likely will be lower than most guidance indicated. Previous thoughts were for a slower evolution of this part of the system with wetter weather for Monday, but I’ve shifted this as it does appear that frontal boundary will push things far enough east and south to set us up for a mainly dry Monday. This is when high pressure becomes established to our north and low pressure evolves to our south in a blocking set-up. We then watch to see if low pressure can get close enough to push any additional rain into our region through the middle of the coming week. I think it will be held mostly to the south, but can be close enough at times so that its cloud shield limits sunshine, particularly Tuesday and Thursday (as it looks now). The autumnal equinox marks the start of fall at 8:05 p.m. on Tuesday.

TODAY: Mostly cloudy. Rain chances late morning on but steadiest favors west and south of Boston later afternoon. Highs 65-72. Wind SE up to 10 MPH.

TONIGHT: Cloudy with some rain in the evening then breaking clouds but patchy fog forming overnight. Lows 53-60. Wind E 5-15 MPH shifting to N under 10 MPH.

MONDAY: Clouds and areas of fog early, then a sun / cloud mix. Highs 61-68. Wind N to NE 5-15 MPH.

MONDAY NIGHT: Partly cloudy. Lows 47-54. Wind NE 5-15 MPH.

TUESDAY: Mostly cloudy. Highs 61-68. Wind NE to E 5-15 MPH, gusts above 20 MPH coastal and southern areas.

TUESDAY NIGHT: Mostly to partly cloudy. Lows 47-54. Wind E to NE 5-15 MPH, higher gusts coastal areas.

WEDNESDAY: Partly sunny. Highs 62-69. Wind NE 5-15 MPH but gusts up to 30 MPH in coastal areas especially to the south.

WEDNESDAY NIGHT / THURSDAY: Mostly cloudy. Lows 47-54. Highs 60-67. Wind NE to E 10-20 MPH, higher gusts especially coastal areas.

DAYS 6-10 (SEPTEMBER 25-29)

Blocking pattern remains in place. Watching battle between high pressure to north and low pressure to south. Leaning toward the high winning the battle but low pressure may get close enough for some wet weather in southern areas particularly during the second part of this period based on current thinking. Temperatures near to slightly below normal. A long-lasting fetch of east to northeast wind will likely create rough surf and large swells along the coast many of these days.

DAYS 11-15 (SEPTEMBER 30 – OCTOBER 4)

A mid period rain chance flanked by drier weather episodes. Temperatures variable but mostly near normal.

DAYS 1-5 (SEPTEMBER 19-23)

Beware out there on social media for posts about major storms and dramatic scenarios. Overdone. Here’s a real discussion. Today, we have a beautiful day to open the final summer weekend of summer 2026, although it’s feeling fallish with cool air having moved in from Canada. The sun will still feel nice and give the afternoon a milder feel. Low pressure makes a run at our region Sunday into Monday, but a large portion of this will be deflected to our south. A rain shield expanding on its northern side as warmer, moist air runs into the cooler, drier air to the north, then slides to the east. But that existing dry air will do a number on the rain shield as it moves into our region, limiting how much can fall. And this is why I still lean toward less rain over more, and a later start on Sunday. One thing we will not has is a lot of sunshine. Today is the sunniest day, by far, of this weekend. We get into a cool easterly air flow between high pressure to our north and the low to the south by later Sunday and on into early next week. For now, it looks like low pressure will continue to be held off to or south as we head into the first few days of next week but it can be close enough for some rain to get into southern areas at times – early Monday and later Tuesday as two time frames I’m watching for that. So even in the day 1 through 5 segment, starting with day 2, there is uncertainty in the outlook. I’ll update in comments as things become clearer to me, and of course a full update will be posted tomorrow morning with the new blog! And don’t forget, the autumnal equinox marks the start of fall at 8:05 p.m. on Tuesday.

TODAY: Plenty of sun – some high clouds. Highs 67-74. Wind variable up to 10 MPH.

TONIGHT: Partly cloudy. Lows 47-54. Wind variable to SE up to 10 MPH.

SUNDAY: Mostly cloudy. Rain chances favor west and south of Boston afternoon. Highs 65-72. Wind SE up to 10 MPH.

SUNDAY NIGHT / MONDAY: Cloudy. Chance of rain, especially southern areas. Lows 53-60. Highs 60-67. Wind E 5-15 MPH, higher gusts southern areas.

MONDAY NIGHT / TUESDAY: Mostly cloudy. Additional rain possible favoring the South Coast region. Lows 53-60. Highs 61-68. Wind E 5-15 MPH, higher gusts southern areas.

TUESDAY NIGHT / WEDNESDAY: Slow clearing trend. Lows 47-54. Highs 60-67. Wind NE 5-15 MPH.

DAYS 6-10 (SEPTEMBER 24-28)

For a good portion of this period we watch low pressure to the south while high pressure to the north is expected to stay in control most of the time with a generally dry, cool stretch of weather. Still cannot rule out low pressure surging northward enough to bring a period of rain in sometime in the September 24-25 time frame, so will continue to keep an eye on this potential.

DAYS 11-15 (SEPTEMBER 29 – OCTOBER 3)

Leaning dry September 29-30 and wetter October 1-2, then dry end of period.

DAYS 1-5 (SEPTEMBER 18-22)

Down the home stretch of astronomical summer we go to the autumnal equinox at 8:05 p.m. next Tuesday (September 22). How will our weather be leading up to and including that day? We start with a cold front moving offshore this morning and some lingering clouds over eastern areas, and fog patches mainly in lower elevations with little wind. Drier air sends those packing and we see abundant sun but also some passing fair weather clouds. High pressure builds into the region tonight through Saturday night. This promotes cool nights and a mostly sunny, pleasant Saturday. By Sunday, we’re seeing high pressure try to hold on but eventually give way to a trough of low pressure approaching from the west, but also being deflected to the south as the atmosphere starts to develop a block. The question for Sunday is how quickly clouds advance and how much rain can get into the region before day’s end. Currently, my leaning remains toward a slower scenario with the rain concentration being Sunday night and early Monday. It remains to be seen if a second surge of rain can get in here Monday night or Tuesday, so far now I’ll lean toward rain chances south and drier north in the region.

TODAY: Clouds linger eastern areas early including some patches of fog in lower elevation locations, then sunshine and passing clouds. Highs 68-75. Wind NW increasing to 10-15 MPH with higher gusts.

TONIGHT: Mostly clear to partly cloudy. Lows 40-47 inland, 46-53 coast / urban centers. Wind calm.

SATURDAY: Sunshine can be filtered at times by high clouds. Highs 67-74. Wind variable up to 10 MPH.

SATURDAY NIGHT: Partly cloudy. Lows 47-54. Wind variable to SE up to 10 MPH.

SUNDAY: Mostly cloudy. Highs 65-72. Wind SE up to 10 MPH.

SUNDAY NIGHT / MONDAY: Cloudy. Chance of rain, especially southern areas. Lows 53-60. Highs 60-67. Wind E 5-15 MPH.

MONDAY NIGHT / TUESDAY: Mostly cloudy. Additional rain possible favoring the South Coast region. Lows 53-60. Highs 61-68. Wind E 5-15 MPH.

DAYS 6-10 (SEPTEMBER 23-27)

For a good portion of this period we watch low pressure to the south while high pressure to the north is expected to stay in control most of the time with a generally dry, cool stretch of weather. However, I cannot rule out low pressure surging northward enough to bring a period of rain in sometime in the September 24-25 time frame, so we will keep an eye on this potential.

DAYS 11-15 (SEPTEMBER 28 – OCTOBER 2)

Leaning dry September 28-30 and wetter October 1-2.

DAYS 1-5 (SEPTEMBER 17-21)

High pressure is now to our east as a trough and associated surface low and cold front approach our region from the west. This means today will be a warm, more humid day, with a sun / cloud mix, but clouds eventually taking over. Showers are likely this evening and tonight as the cold front moves through. A few heavy downpours are possible. This activity exits via Cape Cod by dawn on Friday, leaving us with seasonable, breezy, drier weather for the day. Cooler air will be inbound and you’ll feel that by Saturday as high pressure dominates, but the high temps will be about 10 degrees lower than Friday’s. Then, it’s time to try to solve the mystery that is the timing and behavior of the next unsettled threat. This comes in the form of a low pressure area that moves our way later in the weekend and ultimately tracks south of us, but how far south and exactly when is the question to answer, helping to determine if we get through Sunday without much, if any, rainfall, and how much rain can be around into Monday. Yesterday, I was leaning toward a scenario which holds most of the moisture off to our south and west on Sunday, then allows it into the region Sunday night into Monday when we would see most of our rainfall. Today, I am continuing to lean in this direction, but with reservation that the earlier scenario is still in play.

TODAY: Sun dominant until mid afternoon then more clouds late. Highs 75-82. Wind S 5-15 MPH.

TONIGHT: Mostly cloudy with showers likely. Areas of fog Lows 58-65. Wind SW 5-15 MPH.

FRIDAY: Clouds linger eastern areas early, then sunshine and passing clouds. Highs 68-75. Wind NW 5-15 MPH, higher gusts.

FRIDAY NIGHT: Clear. Lows 40-47 inland, 46-53 coast / urban centers. Wind calm.

SATURDAY: Sunshine can be filtered at times by high clouds. Highs 67-74. Wind variable up to 10 MPH.

SATURDAY NIGHT: Partly cloudy. Lows 50-57. Wind SE up to 10 MPH.

SUNDAY: Mostly cloudy. Highs 65-72. Wind SE up to 10 MPH.

SUNDAY NIGHT / MONDAY: Cloudy. Chance of rain, especially southern areas. Lows 53-60. Highs 60-67. Wind E 5-15 MPH.

DAYS 6-10 (SEPTEMBER 22-26)

The uncertainty of the Sunday-Monday time frame leads to a little continued uncertainty early in this period, but I lean toward a dry-out and fair weather returning early in this period, then a shower threat with a trough swinging through the region in the later September 24 to September 25 time window, followed by a shot of cool, dry weather at the end of the period. Autumnal Equinox: 8:05 p.m. September 22.

DAYS 11-15 (SEPTEMBER 27 – OCTOBER 1)

High pressure dominates with fair weather into mid period before some unsettled weather is possible. Temperatures start cool, then moderate to seasonable or slightly above normal.

DAYS 1-5 (SEPTEMBER 16-20)

High pressure slips offshore today. A difference from 24 hours ago – the high still being generally overhead, we did not cool off as much (many 40s yesterday morning, mostly 50s at sunrise today). Why? Higher dew point air arriving, and also a blanket of broken clouds moving in from the west as the warmer air arrives above us as well, although this cloud canopy will largely dissipate as it moves into the region. This leaves us with a day of abundant sun, warmer air, and a little more humidity, though not too noticeable yet. You will notice the humidity later tonight and particularly Thursday and Thursday night when we have a more pronounced southerly air flow ahead of an approaching cold front. That front will bring more cloudiness into our region as we move through the day leading to showery episodes later in the day into the nighttime hours. The front should clear the coast by sunrise on Friday, and that day will turn out dry, breezy, and cooler. Our weekend, similar to last, features a split of sorts. Saturday looks splendid with high pressure in control, though some high clouds may appear in the sky ahead of the next trough, which there is a lot of uncertainty regarding the details of. Some guidance brings full on rainfall in for Sunday, while other guidance holds the system off and suppresses it somewhat to the southwest, keeping our region drier despite more cloudiness. I’ve seen consistency on one model for the latter solution, which is currently the way I am leaning. The result would be a day not as nice as Saturday, but not as wet as last Sunday turned out. Still some tweaking to this part of the forecast likely. Check back!

TODAY: Early-day clouds, then abundant sun and a few clouds. Highs 73-80. Wind S 5-15 MPH.

TONIGHT: Mostly clear. Patchy fog. Lows 53-60. Wind SW up to 10 MPH.

THURSDAY: Sun dominant until mid afternoon then more clouds late. Highs 75-82. Wind S 5-15 MPH.

THURSDAY NIGHT: Mostly cloudy with showers likely. Lows 56-63. Wind SW 5-15 MPH.

FRIDAY: Clouds linger eastern areas early, then sunshine and passing clouds. Highs 68-75. Wind NW 5-15 MPH, higher gusts.

FRIDAY NIGHT: Clear. Lows 40-47 inland, 46-53 coast / urban centers. Wind calm.

SATURDAY: Sunshine can be filtered at times by high clouds. Highs 67-74. Wind variable up to 10 MPH.

SATURDAY NIGHT: Partly cloudy. Lows 50-57. Wind SE up to 10 MPH.

SUNDAY: Mostly cloudy. Highs 65-72. Wind SE up to 10 MPH.

DAYS 6-10 (SEPTEMBER 21-25)

Pattern is unsettled overall. Details remains somewhat elusive. Leaning toward a scenario in which a low pressure wave passes south of our region but close enough for a period of rain later September 21 into September 22 to wrap up astronomical summer – autumnal equinox at 8:05 p.m. September 22. One more system could bring additional showers around the middle of next week.

DAYS 11-15 (SEPTEMBER 26-30)

The home stretch of September presents a flip to a drier pattern with temperatures somewhat variable but mostly near normal.

DAYS 1-5 (SEPTEMBER 15-19)

High pressure sits overhead today with plenty of sun. A cool morning is followed by a milder afternoon. High pressure shifts offshore with warmer weather at midweek, eventually more humidity by Thursday. Low pressure passes just to the north bringing a cold front, and associated shower threat, Thursday night. High pressure returns on Friday behind the front with cooler, drier weather, and then the high sits atop the region Friday night and Saturday with tranquil conditions, a chilly nighttime and a milder daytime.

TODAY: Abundant sunshine. Highs 68-75. Wind variable to E up to 10 MPH.

TONIGHT: Mostly clear. Ground fog patches overnight. Lows 48-55. Wind SE under 10 MPH.

WEDNESDAY: Sunny to partly cloudy. Highs 73-80. Wind S 5-15 MPH.

WEDNESDAY NIGHT: Partly cloudy. Patchy fog. Lows 53-60. Wind SW up to 10 MPH.

THURSDAY: Sun dominant until mid afternoon then more clouds late. Highs 75-82. Wind SW 5-15 MPH.

THURSDAY NIGHT: Mostly cloudy with showers likely. Lows 56-63. Wind SW 5-15 MPH.

FRIDAY: Mostly cloudy with potential showers early, then clearing. Highs 68-75. Wind NW 5-15 MPH.

FRIDAY NIGHT: Clear. Lows 40-47 inland, 46-53 coast / urban centers. Wind calm.

SATURDAY: Sunny. Highs 67-74. Wind variable up to 10 MPH.

DAYS 6-10 (SEPTEMBER 20-24)

A more unsettled pattern evolves, but that does not mean 5 days of rainy weather either. As previously mentioned, guidance has been inconsistent here, and the unsettled pattern probably means a couple or a few days of showery weather, maybe a period of steadier rainfall in there at some point. Details TBD. Temperatures variable – no extremes. One certainty: Autumnal Equinox at 8:05 p.m. September 22.

DAYS 11-15 (SEPTEMBER 25-29)

Outlook trends drier here. Temperatures fairly seasonable.

DAYS 1-5 (SEPTEMBER 14-18)

A cold front moves offshore early this morning taking any showers with it. This will be followed by a breezy, drier day with sunshine returning, though passing fair weather clouds will dot the sky as well. High pressure builds over the region tonight and Tuesday with fair weather and lighter wind. This promotes a cool night tonight, and a nice rebound to milder air Tuesday afternoon. The high moves offshore, bringing in warmer late summer air for midweek – Wednesday and Thursday. A cold front approaches later Thursday, especially evening and nighttime with lots of clouds and the potential for showers, which will then depart on Friday as another area of high pressure moves in behind the front with a return to fair weather.

TODAY: Early clouds with scattered showers mainly I-95 belt eastward, then sunshine and passing clouds. Highs 70-77. Wind NW 5-15 MPH, gusts 20-25 MPH.

TONIGHT: Clear. Ground fog patches late night. Lows 45-52, coolest interior valleys, mildest urban centers and coast. Wind N dropping to under 10 MPH.

TUESDAY: Abundant sunshine. Highs 68-75. Wind variable to E up to 10 MPH.

TUESDAY NIGHT: Mostly clear. Ground fog patches overnight. Lows 48-55. Wind SE under 10 MPH.

WEDNESDAY: Sunny to partly cloudy. Highs 73-80. Wind S 5-15 MPH.

WEDNESDAY NIGHT: Partly cloudy. Patchy fog. Lows 53-60. Wind SW up to 10 MPH.

THURSDAY: Sun dominant until mid afternoon then more clouds late. Highs 75-82. Wind SW 5-15 MPH.

THURSDAY NIGHT: Mostly cloudy with showers likely. Lows 56-63. Wind SW 5-15 MPH.

FRIDAY: Mostly cloudy with potential showers early, then clearing. Highs 68-75. Wind NW 5-15 MPH.

DAYS 6-10 (SEPTEMBER 19-23)

Guidance is not consistent in the medium range so it doesn’t aid much in forecast confidence, but current expectations are for weather to start and finish the September 19-20 weekend with an interruption from a passing disturbance somewhere between there, bringing a shower chance. There are a few indications of a more significant trough pushing another shower threat into the region early next week – but uncertain. The Autumnal Equinox occurs at 8:05 p.m. EDT on September 22.

DAYS 11-15 (SEPTEMBER 24-28)

Trend is for only a brief shower threat somewhere early or mid period with otherwise mostly fair weather and slight cooling trend in the early days of autumn.

DAYS 1-5 (SEPTEMBER 13-17)

And now to the unsettled portion of the weekend 50/50. There is some good news though: The rain coming in will be beneficial as much of the region does still remain in a longer-term deficit going back through the start of this year. So this will help in that regard. It won’t help in regard to the potential flooding from fairly high rainfall rates later today, particularly over RI and southeastern MA, where we can see embedded thunder and even the remote chance of a brief, weak tornado if any convective cells can get organized enough. The rest of the region sees more of a general moderate to borderline heavy rainfall moving in this morning and moving out by day’s end. This all comes from a wave of low pressure developing and moving northeastward across our region, its center crossing southeastern MA around mid afternoon. As this moves offshore it will take the rain with it and some clearing starts to work in from the west toward the end of the day. But with the sunset now just prior to 7 p.m., areas to the west of Boston stand the greatest chance of seeing any sun before it goes down. Some clearing takes place this evening before another batch of clouds arrives overnight to first thing Monday morning with a cold front crossing the region. This front can produce a few showers. The balance of Monday ends up dry and breezy behind the front with today’s humidity being replace by drier air. High pressure builds in with abundant sunshine for Tuesday – a cool morning and a milder afternoon. High pressure shifts offshore at midweek when we see generally fair but warmer and somewhat more humid weather. For now, it looks like the next frontal system will hold off until at least late Thursday (maybe beyond).

TODAY: Cloudy as rain overspreads the region this morning and continues into afternoon before tapering off from southwest to northeast later in the day, including embedded heavier downpours with thunder potential, especially RI and southeastern MA. Areas of fog forming. Clouds break from west to east late. Humid. Highs 66-73. Wind S shifts to E 5-15 MPH, but variable across Cape Cod where brief strong gusts can occur with any downpours / t-storms.

TONIGHT: Clearing evening, then clouds return overnight with a shower chance. Patchy fog. Lows 56-63. Wind SW 5-15 MPH.

MONDAY: Early clouds and a shower chance particularly eastern areas, then sunshine and passing clouds. Highs 70-77. Wind NW 5-15 MPH, gusts 20-25 MPH.

MONDAY NIGHT: Mostly clear. Fog patches in low elevations. Lows 49-56. Wind NW under 10 MPH.

TUESDAY: Sunny. Highs 68-75. Wind variable up to 10 MPH.

TUESDAY NIGHT: Partly cloudy. Fog patches. Lows 50-57. Wind S up to 10 MPH.

WEDNESDAY: Partly cloudy. Highs 75-82. Wind SW 5-15 MPH.

WEDNESDAY NIGHT: Partly cloudy. Patchy fog. Lows 53-60. Wind SW up to 10 MPH.

THURSDAY: Partly sunny. Highs 76-83. Wind SW 5-15 MPH.

DAYS 6-10 (SEPTEMBER 18-22)

Current expected timing suggest a cold front moves through with a shower threat early September 18, followed by fair weather to start the weekend (September 19), then another unsettled threat around September 20-21 before fair weather returns at the end of the period, just in time for the Autumnal Equinox which occurs at 8:05 p.m. EDT on September 22.

DAYS 11-15 (SEPTEMBER 23-27)

Early days of autumn have the outlook of one unsettled threat around September 24 and a general cooling trend.

DAYS 1-5 (SEPTEMBER 12-16)

A 50/50 fair/foul weekend. Today’s the fair day, high pressure atop the region for a cool start, then sliding offshore for a milder afternoon as we see plenty of sun, but an increase in high to mid level clouds later on, ahead of the “50 / foul”, which is in response to a trough of low pressure moving through on Sunday. A surface low will form and move across the region, with plenty of moisture to drawn from, so it now seems a significant rainfall occurs over several hours from Sunday morning to about mid afternoon – progression generally southwest to northeast for both start and end of rainfall. Rainfall amounts of 0.50 to 1.50 should be widespread, but there will be pockets that exceed 1.50 and rainfall rates that can be high enough to result in some flooding issues, particularly in RI and southeastern MA. Improvement comes late in the day as the low starts to pull away. An additional cold front needs to cross the region in the pre-dawn hours of Monday, and that can bring a passing shower. Monday and Tuesday will be fair, less humid days after a spike of high humidity with Sunday’s system. Monday we’ll have a northwesterly breeze as the drier air advects in behind the front, and Tuesday’s weather will be tranquil under high pressure. Wednesday, the high slides offshore, and we see the return of some late summer warmth and a bit of humidity to go with it.

TODAY: Abundant sun then high clouds arrive late. Highs 70-77. Wind variable up to 10 MPH.

TONIGHT: Clouding over. Fog patches overnight. Rain potential South Coast toward dawn. Lows 55-62. Wind S up to 10 MPH becoming variable.

SUNDAY: Cloudy with areas of fog until mid afternoon with rain likely, along with embedded heavier downpours – particularly RI & southeastern MA. Rain departs and clouds break for sunshine west to east later on. High humidity. Highs 68-75 (may occur late-day). Wind variable, mostly S to SW, 5-15 MPH.

SUNDAY NIGHT: Variably cloudy. An additional shower possible. Patchy fog. Lows 56-63. Wind SW up to 10 MPH shifts to NW.

MONDAY: Mostly sunny. Less humid. Highs 71-78. Wind NW 5-15 MPH.

MONDAY NIGHT: Mostly clear. Fog patches in low elevations. Lows 49-56. Wind NW under 10 MPH.

TUESDAY: Sunny. Highs 68-75. Wind variable up to 10 MPH.

TUESDAY NIGHT: Partly cloudy. Fog patches. Lows 50-57. Wind S up to 10 MPH.

WEDNESDAY: Partly cloudy. Highs 75-82. Wind SW 5-15 MPH.

DAYS 6-10 (SEPTEMBER 17-21)

Still warm but a shower chance September 17 as a cold front passes through the region. Cooler/drier briefly after that, then some additional unsettled weather may roll through the region with another trough and disturbance from the west, departing in time for a fair final full day of astronomical summer.

DAYS 11-15 (SEPTEMBER 22-26)

The Autumnal Equinox occurs at 8:05 p.m. EDT September 22. Pattern looks mostly dry in this stretch of days heading into late month, maybe a brief shower threat a couple times with some changeable temperatures trending slightly cooler.

DAYS 1-5 (SEPTEMBER 11-15)

A little more tweaking in the shorter term forecast as details on the weekend trough / low pressure system become more clear. You may remember a few days ago I mentioned this weekend looking great, and all guidance reflected that idea of high pressure in control the entire time with fair weather. But guidance is not always so good, and sometimes it leads us astray, which it did in this case for me. So now we talk about a bit of a split this weekend. But before that, we do have a nice day today with high pressure in control, building in from the west. A ribbon of high clouds provided a nice sunrise if you were up for it, but sunshine will be abundant today along with dry air and a northwesterly breeze. As high pressure moves overhead tonight, winds die off and radiational cooling takes hold. The temperature spread you saw on my previous forecast will definitely not be adequate enough to cover the range in temperature we will see for later tonight to Saturday morning for low temperatures, where the normal colder spots can drop to around 40 while the urban areas can stay at or above 50. The high will still have enough influence so that our weather is fair on Saturday, to start the weekend, but you’ll notice more high to mid level cloudiness starting to show up later on ahead of our next trough – the one initially underestimated by guidance. This system will move through during Sunday. An initial disturbance going by just to our southeast will toss a batch of moisture our way with rain and embedded heavier showers moving through the region Sunday morning to midday from southwest to northeast. This will be followed by a clearing trend and some sunshine should return to the region during the afternoon in the same progression the rain had. You will notice another spike in humidity during Sunday. A cold front still has to move through and will do so later at night with a shower threat. High pressure builds in during Monday and Tuesday with fair weather and lower humidity again. Previously, I had this progression faster and hinted at much warmer weather Tuesday than we will probably end up with, but it will still be on the mild side.

TODAY: High clouds can filter the early-day sun, then brighter sun with just a few passing fair-weather clouds. Highs 71-78. Wind NW 5-15 MPH, a few higher gusts.

TONIGHT: Patchy high clouds but mainly clear. Lows 40-47 valleys, swamps, and bogs, 47-54 elsewhere with mildest in urban centers. Wind NW up to 10 MPH dropping to calm.

SATURDAY: Lots of sun, but more high and middle clouds later. Highs 70-77. Wind variable up to 10 MPH.

SATURDAY NIGHT: Increasing clouds. Fog patches overnight. Rain potential South Coast toward dawn. Lows 55-62. Wind S up to 10 MPH becoming variable.

SUNDAY: Cloudy start with a period of rain in the morning to midday, steadiest and longest-lasting I-95 belt eastward, including embedded heavier showers, as well as patchy fog. Clouds break for sun afternoon. Humid. Highs 70-77. Wind variable becoming SW 5-15 MPH.

SUNDAY NIGHT: Variably cloudy. An additional shower possible. Patchy fog. Lows 56-63. Wind SW up to 10 MPH shifts to NW.

MONDAY: Mostly sunny. Less humid. Highs 71-78. Wind NW 5-15 MPH.

MONDAY NIGHT: Mostly clear. Fog patches in low elevations. Lows 51-58. Wind NW under 10 MPH.

TUESDAY: Sunny. Highs 72-79. Wind variable up to 10 MPH.

DAYS 6-10 (SEPTEMBER 16-20)

Warm, fair weather September 16. Shower chance September 17. Dry, cooler later next week.

DAYS 11-15 (SEPTEMBER 21-25)

Shower chances greatest September 24-25, with fair weather expected leading up to that. Temperatures variable, but not too far from normal. Autumnal equinox is at 8:05 p.m. EDT on September 22.

DAYS 1-5 (SEPTEMBER 10-14)

A front moves offshore early today taking showers with it, the last of them moving across southeastern MA as I write this (about 7:00 a.m.). It’s a cold front, but the air is not exactly “cold” behind it. The upper air and drying surface support quite a warm day today with the aid of high pressure moving in aloft combined with a healthy downsloping westerly breeze at the surface. So today will bring the feel of mid summer, other than the sun angle now being noticeably lower than that time of year. The air does cool tonight and Friday as high pressure builds toward our region but Friday is a splendid mid September day! The high overhead allows Friday night to cool down quite a bit even though some cloudiness slides by our region. Sunshine dominates Saturday as high pressure sits atop our region – a perfect day for outdoor activities! High pressure slides offshore Saturday night and sits to our east Sunday and Monday. Shorter range model guidance has shifted to a wetter look for a portion of Sunday with lots of clouds and shower chances. I’m leaning this way, but not quite as much as the guidance is, and for only a part of the day. Timing is still to be refined but as of this update I am leaning toward pre-dawn to mid morning for the greatest Sunday shower threat, after which we’ll see at least some partial clearing and a “not-bad” day, albeit noticeably more humid. With systems a bit more pronounced, i.e. Sunday’s disturbance forming a low pressure area as it moves out, and a little more defined high pressure area coming in behind it, Monday’s weather looks fair but less humid as a little bit of Canadian air would get pulled into the region. Temperatures do remain above normal as there is not a notable delivery of cool air with that high.

TODAY: Clouds and showers depart southeastern MA first thing, otherwise sun and patchy clouds. Humidity notable but reducing later. Highs 80-87 except sub-80 particularly near the South Coast. Wind W 5-15 MPH, gusts 20-25 MPH.

TONIGHT: Partly cloudy. Lows 51-58. Wind W to NW 5-15 MPH.

FRIDAY: Sun and passing clouds. Highs 70-77. Wind NW 5-15 MPH.

FRIDAY NIGHT: Variably cloudy. Lows 47-54. Wind N under 10 MPH.

SATURDAY: Sunny. Highs 68-75. Wind N to variable up to 10 MPH.

SATURDAY NIGHT: Clouds increase. Shower chances and fog patches pre-dawn. Lows 55-62. Wind S up to 10 MPH.

SUNDAY: Cloudy start with showers and patchy fog, then clouds break for sun by midday on. Humid. Highs 71-78. Wind S 5-15 MPH shifts to W.

SUNDAY NIGHT: Partly cloudy. Patchy fog. Lows 57-64. Wind NW under 10 MPH.

MONDAY: Mostly sunny. Less humid. Highs 73-80. Wind NW up to 10 MPH.

DAYS 6-10 (SEPTEMBER 15-19)

Warm but fair September 15. Shower potential early September 16 with a passing frontal system. Dry, cooler later September 16 through September 18 followed by a warm-up at the end of the period.

DAYS 11-15 (SEPTEMBER 20-24)

Shower chances early and end of period, but overall pattern is dry with up-and-down temperatures and no extremes. Autumnal equinox is at 8:05 p.m. EDT on September 22.

DAYS 1-5 (SEPTEMBER 9-13)

Low pressure approaches today, passes north of our region tonight, and departs to the east Thursday. Its warm front brings us a period of rain this evening, favoring areas north of I-90. Its cold front brings showers mainly during the few hours either side of sunrise Thursday, favoring the earlier part of that window, from west to east. Humidity edges up today, goes up more quickly tonight and early Thursday, then lowers again later Thursday as a wedge of subtropical air moves through with the passing system. High pressure builds in Friday and moves across the region Saturday providing fair weather with low humidity. The high slides offshore by Sunday when humidity comes back along with some clouds and a shower chance, though much of that day does look rain-free.

TODAY: Mostly cloudy. Rain chance by late-day especially north and west of Boston. Highs 68-75. Wind variable up to 10 MPH becoming SE to S 5-15 MPH.

TONIGHT: Cloudy evening with a period of rain, favoring north of I-90. Additional showers overnight. Areas of fog. Lows 63-70. Dew point spikes over 60. Wind S to SW up to 10 MPH.

THURSDAY: Mostly cloudy with shower chances early, then a sun / cloud mix. Humid morning, then drying. Highs 78-85. Wind SW 5-15 MPH shifting to W.

THURSDAY NIGHT: Partly cloudy. Lows 51-58. Wind W to NW 5-15 MPH.

FRIDAY: Sun and passing clouds. Highs 68-75. Wind NW 5-15 MPH.

FRIDAY NIGHT: Mostly clear. Lows 46-53. Wind N under 10 MPH.

SATURDAY: Sunny. Highs 66-73. Wind N to variable up to 10 MPH.

SATURDAY NIGHT: Partly cloudy. Lows 50-57. Wind SW up to 10 MPH.

SUNDAY: Partly sunny. Chance of a shower. Highs 71-78. Wind S 5-15 MPH.

DAYS 6-10 (SEPTEMBER 14-18)

Above normal temperatures early next week until a front goes by between late September 15 and early September 16, returning dry and seasonable weather to the region. Shower chances with the frontal passage, otherwise a mainly dry pattern.

DAYS 11-15 (SEPTEMBER 19-23)

Shower chances limited, dry weather dominant. Some up-and-down temps but no extremes seen. The autumnal equinox is at 8:05 p.m. EDT on September 22.

DAYS 1-5 (SEPTEMBER 8-12)

Trough swings through today but you’ll hardly notice it other than some clouds passing by in the sky. Otherwise, it’s a pretty nice September day with mild and comfortably dry air. Unsettled weather is coming though as a low pressure area dives east southeastward and passes through our region later Wednesday through early Thursday. Its warm front gives our area a round of rainfall Wednesday evening. Its cold front follows it with showers Thursday morning. This quick mover is then gone and we dry out the remainder of Thursday, although the frontal boundary slows just enough with a wave of low pressure moving along it to bring the chance of some early morning showers on Friday near the South Coast. Otherwise, dry weather will be dominant here on Friday and Saturday as high pressure builds back in.

TODAY: Sun and passing clouds. Highs 73-80. Wind W 5-15 MPH shifts to NW.

TONIGHT: Clear, then high clouds arrive overnight. Inland low elevation fog patches. Lows 50-57. Wind N under 10 MPH then calm.

WEDNESDAY: Increasing clouds. Rain chance by late-day especially north and west of Boston. Highs 68-75. Wind variable up to 10 MPH becoming SE to S 5-15 MPH.

WEDNESDAY NIGHT: Cloudy. A period of rain. Areas of fog. Lows 60-67. Wind S to SW up to 10 MPH.

THURSDAY: Mostly cloudy with showers likely until midday including a slight chance of a thunderstorm. Partly cloudy afternoon. Humid morning, then drying. Highs 72-79. Wind SW 5-15 MPH shifting to W.

THURSDAY NIGHT: Partly cloudy. Lows 51-58. Wind W to NW 5-15 MPH.

FRIDAY: Sun and passing clouds. Highs 68-75. Wind NW 5-15 MPH.

FRIDAY NIGHT: Mostly clear. Lows 46-53. Wind N under 10 MPH.

SATURDAY: Sunny. Highs 66-73. Wind N to variable up to 10 MPH.

DAYS 6-10 (SEPTEMBER 13-17)

High pressure slips offshore to end the weekend and the beginning of next week. A frontal boundary gets closer from the northwest but this time a southwesterly flow aloft for a few days will keep it from whipping through, instead keeping our region on the warmer side of it until a low goes by to the north and finally pulls it by the region, allowing drier, cooler weather to settle in for later in the period.

DAYS 11-15 (SEPTEMBER 18-22)

Down the home stretch of astronomical summer we go with a pattern that features limited shower chances and a gradual cooling trend. The autumnal equinox is at 8:05 p.m. EDT on September 22.

DAYS 1-5 (SEPTEMBER 7-11)

High pressure builds as upper level low pressure departs, resulting in fair, pleasant weather for today. While many folks use this as a travel day and not a day to enjoy, at least the weather favors travel! Our nice weather will continue on Tuesday even though a weak trough will scoot through the region with some clouds. You’ll find it a bit warmer than today. The outlook remains the same heading into midweek with a low pressure area set to move east southeast in a northwesterly flow aloft. This will cloud us up on Wednesday with episodes of showery weather Wednesday night and Thursday. This system exits by Friday and high pressure builds in that day with fair weather returning. A humidity spike accompanies Thursday’s unsettled weather, but it will be short-lived when a batch of dry air follows it quickly on Friday.

TODAY – LABOR DAY: Sun and passing clouds. Highs 71-78. Wind NW 5-15 MPH.

TONIGHT: Mostly clear. Lows 52-59. Wind W up to 10 MPH.

TUESDAY: Sunny morning then a sun / cloud mix. Highs 73-80. Wind SW 5-15 MPH shifts to NW late.

TUESDAY NIGHT: Clearing. Inland low elevation fog patches. Lows 50-57. Wind N under 10 MPH then calm.

WEDNESDAY: Increasing clouds. Shower chance by late-day especially north and west of Boston. Highs 68-75. Wind variable up to 10 MPH becoming SE to S 5-15 MPH.

WEDNESDAY NIGHT: Cloudy. Scattered showers. Areas of fog. Lows 60-67. Wind S to SW up to 10 MPH.

THURSDAY: Mostly cloudy with showers likely through midday including a slight chance of a thunderstorm. Partly sunny with an additional shower possible in the afternoon. Humid. Highs 72-79. Wind SW 5-15 MPH shifting to W.

THURSDAY NIGHT: Partly cloudy. Lows 51-58. Wind W to NW 5-15 MPH.

FRIDAY: Sun and passing clouds. Highs 68-75. Wind NW 5-15 MPH.

DAYS 6-10 (SEPTEMBER 12-16)

High pressure moves overhead then offshore between September 12 and 14 with fair weather and typical end-of-summer cooler mornings but warmer afternoons with notable temperature spreads from lows to highs. Watching the next frontal system for a shower potential later in the period – September 15 to early 16. If this front is slow enough, September 15 can end up a very warm day.

DAYS 11-15 (SEPTEMBER 17-21)

The final five full days of astronomical summer carry a mainly fair weather pattern with 1 or 2 brief interruptions for showers from passing systems. Temperature ups and downs but with an overall cooling trend.

DAYS 1-5 (SEPTEMBER 6-10)

A speed-bump in our weekend in the form of showers from early to mid morning today as a more vigorous than expected disturbance wheels through with the upper trough over our region. This does give way to fair weather with a sun cloud mix taking over from north to south by later morning onward. The rest of the forecast is basically unchanged with a nice Labor Day ahead, a quick-moving trough bringing a shower threat the first part of Tuesday, then the next system in a northwest flow bringing us unsettled weather later Wednesday into Thursday. More details on that on the next blog update!

TODAY: Lots of clouds and scattered showers into mid morning then a sun / cloud mix. Highs 68-75. Wind N to NE 5-15 MPH.

TONIGHT: Mostly clear. Lows 48-55. Wind N up to 10 MPH.

MONDAY – LABOR DAY: Sun and passing clouds. Highs 71-78. Wind NW 5-15 MPH.

MONDAY NIGHT: Variably cloudy. Lows 51-58. Wind W 5-15 MPH.

TUESDAY: Variably cloudy with passing showers possible until midday, then more sunshine. Highs 70-77. Wind W shifting to N 5-15 MPH.

TUESDAY NIGHT: Clear. Fog patches interior low elevations. Lows 50-57. Wind variable under 10 MPH.

WEDNESDAY: Increasing clouds. Shower chance returns late-day. Highs 68-75. Wind variable up to 10 MPH.

WEDNESDAY NIGHT: Mostly cloudy. Showers likely. Chance of a thunderstorm. Lows 60-67. Wind SW 5-15 MPH.

THURSDAY: Variably cloudy. Possible showers. Highs 68-75. Wind W 5-15 MPH.

DAYS 6-10 (SEPTEMBER 11-15)

High pressure moves in then overhead then offshore between September 11 and 14 with fair, cooler weather at first then a warm-up. Next disturbance brings the chance of unsettled weather by the end of the period.

DAYS 11-15 (SEPTEMBER 16-20)

Unsettled weather episodes should be brief early and again later in the period in an otherwise mostly dry pattern with some temperature ups and downs but nothing extreme.