Tuesday September 9 2025 Forecast (7:23AM)

67 Comments

DAYS 1-5 (SEPTEMBER 9-13)

An area of high pressure to our north provides fair, pleasant weather today. Low pressure passing to the southeast of New England will influence our weather for about 36 hours starting this evening, ending early Thursday. The sequence of events associated with the passage of the low will be… High to mid level cloudiness increases from south to north this evening through Wednesday’s early morning hours; lower stratus clouds join in from the east and northeast, but not until the low level moisture is abundant enough, which happens from southeast to northwest, starting with Cape Cod; While most rain stays offshore from the system, patches of light rainfall become more likely near the South Coast, especially over Cape Cod, with sprinkles of lighter rain expanding northward across our region, while patches of drizzle associated with the lower clouds can also occur; Drier air begins its return Wednesday night, first pushing the lower clouds and drizzle patches out of the area from north to south, after which we see a retreat of the middle and high cloud deck from west to east while it continues to slide northeastward as a whole on the back side of departing low pressure – at most delaying the ability to see the sunrise on Thursday. High pressure returns to control during Thursday and works together with a ridge of high pressure aloft to make this the warmest day of this week. After this, a cold front with an uneventful passage (few clouds, no rain), will return cooler weather to our region late this week as another Canadian high pressure builds toward the region, but stays centered to the north with a north to northeast air flow here.

TODAY: Abundant sun except temporary high cloudiness filtering the sun southeastern MA this morning, then high clouds start to increase from the south late. Highs 67-74. Wind N to NE up to 10 MPH.

TONIGHT: Clouds increase and thicken. Light rain near Cape Cod by dawn. Lows 45-52 except 53-60 Cape Cod. Wind NE to E up to 10 MPH.

WEDNESDAY: Cloudy. Periods of light rain most likely South Coast / Cape Cod and less likely but still possible elsewhere, along with drizzle patches. Highs 63-70. Wind E to NE 5-15 MPH except 15-25 MPH Outer Cape Cod.

WEDNESDAY NIGHT: Cloudy evening with patchy light rain and drizzle, favoring southern and eastern areas of MA, eastern CT as well as RI. Breaking clouds overnight with a clearing trend from west to east. Patchy fog. Lows 46-53. Wind NE to N 5-15 MPH Cape Cod, under 10 MPH elsewhere.

THURSDAY: Early clouds linger in eastern area, otherwise mostly sunny. Highs 74-81 but a little cooler some coastal areas. Wind N up to 10 MPH but some coastal sea breezes.

THURSDAY NIGHT: Mostly clear. Fog patches possible in low elevation locations. Wind variable under 10 MPH.

FRIDAY: Mostly sunny. Highs 68-75. Wind NW up to 10 MPH.

FRIDAY NIGHT: Mostly clear. Fog patches possible in low elevation locations. Lows 43-50. Wind variable under 10 MPH.

SATURDAY: Mostly sunny. Highs 68-75, coolest in coastal areas. Wind variable up to 10 MPH with coastal sea breezes.

DAYS 6-10 (SEPTEMBER 14-18)

High pressure dominates the weather with dry conditions expected for the September 13-14 weekend. We watch another area of low pressure to the south the first half of next week, but for now it appears high pressure will hold strong enough to keep it offshore. Temperatures near to below normal.

DAYS 11-15 (SEPTEMBER 19-23)

As we through the final few days of summer to the start of autumn (equinox at 2:19 p.m. EDT on September 22), the overall pattern is drier and looks a bit warmer, but still with a cooler shot or two of air from Canada.

67 thoughts on “Tuesday September 9 2025 Forecast (7:23AM)”

  2. Thanks TK !

    Beautiful, large (I think its near perigee), just past full moon in the lower western sky this morning.

    3. The story of my wordle yesterday

      We lost power around 6:30. We rarely lose power in this part of sutton. It woke me up when everything went quiet. I tried to go back to sleep but there was an annoying Chirping sound. At first I thought it was a cricket outside my window which was open but the interval was too regular. It turned out to be our home security system. I’d given up on wordle before bed and planned to finish when I woke up in the am so got back to it. When I saw the letters I and R in spaces 3 and 4 ….i laughingly entered chirp not expecting it to take. An assist by a power failure.

      1. Funny, After my first 2 guess yielded nothing, I entered the word CHIRP for my 3rd guess. Next one was obvious. 🙂

      2. That’s great!

        Without too much thought on my third guess yesterday, I tried “twirp”. It was accepted as a guess. I had to look it up and it’s an alternative spelling of “twerp”. This is new to me.

    1. Awesome shot!!!

      Which flavor grasshopper is that one? or is it something else?
      I caught quite a few grasshoppers in my day, and that particular one was not all that common. I’ve seen it and certainly caught it, but it is not your standard grasshopper.

      1. I don’t know much about grasshoppers. It’s smaller than the ones that we see jumping around elsewhere. Could it be a juvenile, or maybe a different species?

  7. Thanks, TK!

    45, the low this morning.

    TK, were Saturday’s storms the first tornadoes of 2025 in the state? I believe you were keeping track (no pun intended!) 🙂

  14. For the rest of this week I’ve decided I’m not going to be cranky about bad journalism and social media bullcrap, and focus on the weather and the best I can do with it. 🙂

    Looking over the 12z info leads me to basically no forecast changes today. Some of the short range guidance has the low pressure pass maybe just a tiny bit further out. It looks more like a cloudy day with very limited rainfall – maybe just damp at times. Still can see an initial band of rainfall “shed” by the storm come up and probably dissipate as it moves northward. Additional rain would be most likely over Cape Cod, with low level moisture increased enough for those drizzle patches. With the cloud cover and onshore breeze it’ll be cool (60s) but without the “crisp” feel of a drier air mass.

    Everything else looks on track. Dry stretch Thursday through the weekend. Warmest Thursday, cooler thereafter.

    Meanwhile the tropics are taking a season-peak snooze this year.

    Even in the Pacific, where it’s been more active, prior to the development of Kiko, ACE had been running only 38% of normal. Remarkably low! Kiko boosted it a bit as a pretty powerful, longer lasting system, but will be losing punch and missing Hawaii next few days…

    A new disturbance seems likely to evolve onto the next tropical cyclone off the coast of Mexico, but it looks like an over-water path for that one.

      1. That’s hard to say.

        As dead as it is now, if things line up better (less dust, less dry air, less shear, warmer water – which is not likely, a more favorable MJO) then it could take off and go nuts for the back part of the season. I’d lean toward it being more active – I mean how can it not be at least a bit more active? But I would not count on the predicted #’s by the big outlets being reached. I never thought they would to begin with for the reasons we’ve been observing.

    2. Love it. You have a lot on your plate and it’s easy to focus on negatives. Been there. Know that.

  15. I’m a math teacher and for good reason, I’m struggling with wording reading the news.

    Is it 5 different touchdowns from the same rotating cell or 5 tornadoes?

    I’m of the opinion that’s it’s the first, if it was all from the same cell. It’s one tornado that touches down and lifted a bunch of times. ???? It’s not five different cells each having a unique tornado.

    2. Supercells can be cyclic. The mesocyclone can be present throughout its life cycle, but it pulses up and pulses down, and each reorganization can produce a tornado. These are most definitely separate tornadoes even though parented by the same storm.

      If it’s a very brief lift of a funnel then a re-touch-down, it will often be considered a non-continuous damage path and one tornado, but if the funnel lifts for several minutes or more, it’s usually because it’s very disorganized / dissipated, and will re-appear when the meso supports it once again … that is a separate tornado.

      The 5 tornadoes the other day were parented by the same super cell, and likely the same mesocyclone, although you can trace it on radar wavering in intensity during that time. Most definitely correct to count it as 5 separate tornadoes in this case.

  16. Don’t know it this has Been posted. From Pete.

    “FIVE. That’s the final word on the number of tornadoes that hit central Massachusetts on Saturday. How did we see the biggest outbreak in 14 years? #tornadoes #massachusetts”

  17. I guess I’m still confused.

    To me, 5 tornadoes would be if you have a cell traveling from say Hartford, CT to Keene, NH and it has a history of a tornado.

    And you have another cell traveling from Worcester to Lowell and it has a tornado.

    And a 3rd cell from Norwood to Boston with its own tornado and well, one gets the idea.

    Isn’t this 1 cell producing a tornado that hits the ground, lifts, drops to the ground again, then lifts and does this 5 different times.

    I think we had 1 tornado or that’s may take all from the came cell.

    Otherwise in the Midwest and tornado alley, if counted that way, I couldn’t imagine what a tornado count would be in a big outbreak, unless that’s they way they count them across the whole country.

                2. I needed to understand why they called this 5 tornadoes vs 1 tornado.

                  Nearly everyone was reporting 5 tornadoes.

                  But with TK’s explanation above, I better understand why you can call this situation 5 tornadoes. Pete and everyone else is reporting it as 5 and I was struggling to understand why, when it was the same 1 cell.

                  But, I better understand now. It may have seemed like I was doubting/disagreeing but I was just trying to learn. 🙂

  18. This is also not technically a tornado outbreak, the classic sense, but only in number.

    It just happened to be a sustained supercell with ideal conditions to produce several tornadoes. It just as easily could have been 1 and done, but the favorable conditions lasted long, and there were not really any other storms in New England that came close to doing it. Usually an outbreak features multiple tornadic storms. This was basically one, embedded in a line.

  20. Colorful sunset / twilight sky imminent in much of central and eastern MA & adjacent areas of RI & NH.

  23. Further on my remarks about the tornado situation…

    Ironically I hadn’t even seen what Pete wrote before my first comment about “outbreak”. I’d been talking with a colleague. But this all fits together actually.

    Our 5-tornado outbreak the other day can certainly be called an outbreak. In fact, it was 2 shy of New England’s “biggest” outbreak on record, which is 7 tornadoes on July 10 1989.

    Here is a better explanation of why I said this was an outbreak in tornado number but not in a “classic” sense.

    Tornado outbreaks, both here and across the country, are often due to at least a few super cell storms here in the Northeast, and often up to dozens of such storms in places like the Midwest or Plains where these events are more common.

    What I am noting here, as a caveat to the word “outbreak”, is that THIS particular event was all due to one supercell storm, and not a few or several. Even for our area that is a little unusual to see – multiple tornadoes created by one storm only, with no other tornadic storms around.

    So it was not a “typical” outbreak, but notable in that it was all one thunderstorm. Very interesting from a weather geek standpoint, for sure. 🙂

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