Monday September 1 2025 Forecast (7:05AM)

74 Comments

DAYS 1-5 (SEPTEMBER 1-5)

Today is the first day of autumn, but also the last day of summer, but also neither of those! Do you want to figure that out or do I have to explain it? Skip these next several lines if you already know exactly what I mean, or keep reading if you do not: Today is September 1, which is the first day of “meteorological fall” (September 1 thru November 30), and also the last day of “summer” in the tourism sense since it’s the final day of Labor Day Weekend, or just “Labor Day”, which marks the end of the “summer season” for people who do the majority of their long weekends and vacations between Memorial Day and Labor Day. However, it’s not actually the last day of summer or the first day of fall in an astronomical sense, marked by the occurrence of the autumnal equinox, which this year takes place on September 22 at 2:19 p.m. EDT. I’ll leave the decision up to you whether the day of the equinox is the last day of summer, the first day of fall, both (or neither – haha). Now that we have that straightened out, let’s move onto the weather! Today, “the first day of September”, Labor Day, will be a nice day, but we will have a mixture of sun and clouds. The clouds will come in 2 forms – a shield of high clouds fanning across our sky from a low pressure system well to our south that will not do any more to our region than this, and the development of some fair-weather cumulus clouds during the midday and afternoon hours. So it will be a less sunny day than yesterday, but still a nice one, with seasonably mild air and comfortably low humidity. Tuesday through Thursday will feature rain-free weather with an area of high pressure at the surface drifting overhead then offshore, so we experience a gradual warm-up as we head into and through midweek. However, weak upper level low pressure still means that cooler air aloft will allow for the daily development of diurnal cumulus clouds, though none of these will grow enough to produce any shower activity in our area. Friday, a stronger, more humid southerly air flow and the approach of a frontal system and trough from the west means there is the potential for some shower activity, but right now rainfall looks more hit & miss, and not too widespread or long-lasting at any one location. The day will remind you, however, that it is still technically summer (but only in an astronomical sense, not in a meteorological one or a tourism one – haha sorry, had to). 😉

TODAY (LABOR DAY): A sun / cloud mix. Highs 72-79. Wind variable up to 10 MPH with coastal sea breezes.

TONIGHT: Partly cloudy. Patchy fog in low elevation areas. Lows 52-59. Wind W up to 10 MPH.

TUESDAY: Mostly sunny. Highs 73-80. Wind SW up to 10 MPH.

TUESDAY NIGHT: Mostly clear. Patchy fog in low elevation areas. Lows 53-60. Wind SW under 10 MPH.

WEDNESDAY: Mostly sunny. Highs 74-81. Wind SW up to 10 MPH.

WEDNESDAY NIGHT: Mostly clear to partly cloudy. Patchy fog. Lows 55-62. Wind S up to 10 MPH.

THURSDAY: Partly sunny. Highs 75-82. Wind S 5-15 MPH.

THURSDAY NIGHT: Mostly cloudy. Patchy fog. Lows 58-65. Wind S 5-15 MPH.

FRIDAY: Variably cloudy. Scattered showers / slight chance of a thunderstorm. Dew point 60+. Highs 76-83. Wind S 5-15 MPH.

DAYS 6-10 (SEPTEMBER 6-10)

Warmth and higher humidity continues to start the weekend on Saturday (September 6) with a chance of a shower or t-storm ahead of a cold front. Behind the front comes lower humidity to finish the weekend on Sunday (September 7) but some clouds may linger, limiting the sunshine somewhat. High pressure builds in with fair weather during the first half of next week, while we watch offshore unsettled weather once again likely stay offshore. Temperatures early to middle of next week average near to below normal.

DAYS 11-15 (SEPTEMBER 11-15)

A modest warm-up with mainly fair weather. Watching 2 potentials for unsettled weather but favor a better shot with the last one late period. Otherwise, a generally dry pattern dominates.

74 thoughts on “Monday September 1 2025 Forecast (7:05AM)”

  2. Good morning and thank you TK.
    Did not need the Summer/Autumn explanation. I got that for sure. 🙂 No matte how you slice it, the best month of the year for nice weather around these parts. PERFECTION!!!!
    LOVE IT. Keep it coming. 🙂

  3. Thanks, TK.

    David O’Leary, longtime radio host in Boston, has landed a job at WCRB (classical music station: 99.5). He has been around the block, From WAAF to WBCN to WMJX and now WCRB. O’Leary has a great radio voice, though I do miss Laura Carlo. I don’t understand why she was let go.

    1. David O is one of the best!

      He was even a veejay on V-66 in Boston playing music videos in the mid to late 1980s!

  9. TK!!!!
    Love the discussion today!

    Also by the way you are the only forecaster anywhere that I saw to mention the high clouds and where they were coming from!

    DOH!!!!

      1. Thank you SClarke. I am not sure what has happened, but
        I seem to be a different player than a week ago.

        My starting word got all 5 letters, NONE of which were in the correct position. So I had all of the letters which is good.
        I had 5 letters in there that I wasn’t even sure it spelled a realy word and I meant to back them out and hit enter by accident. At least it yielded 1 letter in the correct position which allowed my to get the correct word.

        My starting word has been performing for me lately.
        that MAY be the ONLY reason I am faring better currently.
        As soon as my starting word started yielding crap, I’ll be up shit creek without a paddle again. 🙂 🙂 🙂

        Btw, I am currently using SLATE as my starting word.
        You can see how it gave me all 5 letters. 🙂
        Second guess would be DONUT if the first yielded nothing.
        Didn’t need that guess.
        Tips from online. Not sure how statiscally decent these are, but for now not messing with it.

        Cheers

  15. Two Forbes pieces posted this morning:

    1. I cover the changes in eligibility for and access to Covid vaccines. https://www.forbes.com/sites/joshuacohen/2025/09/01/new-limits-on-whos-eligible-for-covid-19-vaccines-raise-access-questions/

    2. I cover the purge at CDC and its implications for the public health apparatus in this country. https://www.forbes.com/sites/joshuacohen/2025/09/01/purge-at-cdc-has-major-implications-for-the-agencys-future-and-public-health/

        2. Interesting catch. The animals look more like the Beatles. I think house was released after the Beatles and Louie Louie before. Just a wild guess

      1. Tied 3-3 middle of the 4th.

        This team is going to drive me crazy between now and the playoffs…assuming they make them.

        1. Are we talking about the same team? They’ve been playing great baseball since the All Star Break, and like any team, they’ve had a few hiccups.

          They’ll be in the post season.

          It’s been quite easy to watch these guys play for the last month plus. 🙂

            1. All season no matter where I go I see people talking about how bad they are, how much they suck, etc.

              They have played some poor games and stretches, yes.

              They don’t suck.

              Yes, there were some rough stretches pre All-Star break. But let’s look at August.

              28 games. 17-11 record (not too shabby for a team everybody had “counted out”).

              This includes a 3 game series sweep against the Astros, 2 out of 3 against the the Royals, the same against the Marlins, 3 out of 4 against the Yankees IN New York, and a 4 game sweep of the Orioles.

              That’s pretty good baseball, overall, despite some hiccups.

  19. TK – When you get a chance, can you post the final stats on August?

    This has been the best August temperature-wise in recent memory. If only we could have bottled it up to cover June and July as well. 🙂

    1. Despite some claims to the contrary **cough**WBZ**cough**, June & July were not “very hot”. They were both less than 2 degrees above normal. There were “very hot” days, and a stretch of very high humidity in July, but neither month was “very hot” by departure definition. The departure for June through August at Boston was +0.5F. Yeah, not “very hot”. 😉

      August landed right in my predicted range of -2.0 to -2.5 for Boston at -2.1F.

      August at Boston was very dry, with only 0.83 total precipitation, a deficit for the month of -2.40 inches, capping off a summer that was quite dry and setting us up for a solid drought if we don’t get relief soon (and there is no real wet weather in sight).

      Other temp departures for August…

      Worcester: -1.5F
      Blue Hill: -1.8F
      Hartford: -2.9F
      Providence: -3.3F

      Coolest August in over a decade (I think 17 years, but don’t quote me on that).

      2. I’m assuming you mean WBz radio. It’s been what I consider an old fashioned (my old fashioned goes back to 80s maybe 70s) august.

  20. Today’s operational ECMWF from 12z says we will go through the warmer, more humid interlude late week but come back out of it without much rainfall occurring during the protracted transition. I can see this being pretty close to correct, if not right on the money.

    And it comes as zero surprise that the GFS has decided that we’re not going to get a hurricane from the east southeast late in the period, but it’ll probably change its mind, and then change it again, and again, and again ………. and again ……………….. and again ………………………………. because, well……………….. it’s the GFS.

  21. To TK:
    Considering climbing in the Whites this Saturday but I do not like climbing on wet granite! It can get dangerous. Wondering about a prognostication for NH on Saturday.

    1. I think they have a better than 50% chance of being rather showery, including the chance of thunderstorms.

  22. CFS & CanSIPS long range models remain consistent in an overall cool to cold, dry theme going from autumn 2025 through winter 2025-2026.

    1. Would like to see a cold and “wet” theme for winter 2025-26. ❄️

      I suppose with our luck it doesn’t get wet again until spring 2026.

      2. “Dry” does not necessarily mean “below normal snow”.
        The same way that “wet” does not necessarily mean “above normal snow”.

        Don’t read terms like that as absolute yes and no meanings.

        We’re talking about the atmosphere here. 🙂

  23. It’s been a cool cloudy day along the shores of Buzzards Bay today – feels like its been a short beach season and a feeling there are not many more beach days left in the year

  24. It’s too soon yet some august temp data

    United States:
    In Raleigh, North Carolina, August 2025 was the sixth-coolest on record, according to WRAL.com.
    Spain:
    Summer 2025 was one of Spain’s hottest ever, driven by a historic August heatwave, though the global August record was not broken.
    Europe:
    The Met Office reported that Summer 2025 was the warmest on record for the UK, beating the previous high from 2018.

  25. Red Sox win and in 2nd place, 2.5 games out of 1st! I pegged them at .520 to a max of .540. They are at .555!

    I just want them to keep the errors to a minimum!

  27. The USA has been experiencing not a hot summer for sure but it managed to be in one of the pockets of cooler overall and still will manage to be around average to warmer than average for many. Across much of the world it was very warm. USA has floods, areas of Europe and Asia is on Fire. Extremes have been increasing with less in between linked to climate change and natural processes.

    As mentioned above CANSIPS shows average to cool conditions for the winter but generally dry, but there are signals for a possible favorable storm pattern for snow. Some of our best snow years we had below avg moisture.

    1. also I rather it be cool and dry and warm and wet, it lets the ski areas make snow and build up that base

  28. From Matt Noyes …

    ”I wish you’d come back to TV.” ✅ DONE!!!

    Ever since I left TV to go digital, your feedback has been split between “Love the app!” and “Come back to TV!” Danielle and I listened…and the result is New England’s first-ever weather network – digital and, YES, it’s built for TV, too.

    On your Smart TV: Open the YouTube app, search “1DegreeOutside Network” and watch the choice marked LIVE in red.

    On your computer: Direct link to 1DegreeOutside.Live, or you can link to it from our 1DegreeOutside.com homepage.

    On your phone or tablet: On the latest version of our 1DegreeOutside app, there’s a big link at the top of the Home Screen to watch.

    Danielle and I are so happy to be back in your living room…as well as in your pocket! Try it out to jumpstart your day ⏰(first video hits at 4:30am)…at the office …in the waiting room…or to unwind at the end of the day and prep for tomorrow…

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