Saturday September 20 2025 Forecast (9:21AM)

43 Comments

DAYS 1-5 (SEPTEMBER 20-24)

High pressure brings fair and pleasantly cool weather to the region this weekend. Tonight will be a chilly one with perfect conditions for radiational cooling as the high pressure center sits right over the region. The high center shifts to the east early next week and we experience a warming trend. Eventually the next trough and frontal system makes its way our way with increased moisture, including the chance of some shower activity. Initially, my thoughts are to lean for less rainfall than models indicate as they usually over-forecast rainfall in a drought situation, which much of our region is in now. Nevertheless, we will watch for a chance of some wet weather from later Tuesday into Wednesday as it stands now, and refine the expectations in future updates. Autumn begins at 2:19 p.m. EDT Monday with the occurrence of the equinox.

TODAY: Mostly sunny. Highs 63-70. Wind N 5-15 MPH, diminishing late.

TONIGHT: Clear. Lows 36-43 inland low elevations, 43-50 elsewhere – mildest in urban centers. Wind calm.

SUNDAY: Mostly sunny. Highs 65-72. Wind variable to S up to 10 MPH.

SUNDAY NIGHT: Mostly clear. Patchy fog. Lows 50-57. Wind S up to 10 MPH.

MONDAY: Mostly sunny to partly cloudy. Highs 72-79. Wind S 5-15 MPH.

MONDAY NIGHT: Mostly clear. Patchy fog. Lows 53-60. Wind S up to 10 MPH.

TUESDAY: Partly sunny. Highs 70-77 South Coast, 77-84 elsewhere. Wind SW 5-15 MPH.

TUESDAY NIGHT / WEDNESDAY: Variably cloudy. Chance of showers. Areas of fog. Lows 60-67. Highs 68-75. Dew point 60+. Wind SW to variable 5-15 MPH.

DAYS 6-10 (SEPTEMBER 25-29)

Some guidance indicates additional unsettled weather in the September 25-26 time frame, and I can see reason to include them in the forecast, but with low confidence at this point. Drier weather dominates thereafter. Temperatures near to slightly above normal for the period overall.

DAYS 11-15 (SEPTEMBER 30 – OCTOBER 4)

Leaning drier and milder than average for end September / start October. More to say about this as things become a bit more clear.

43 thoughts on “Saturday September 20 2025 Forecast (9:21AM)”

    1. You’ll be at about 44 tomorrow morning, but I’ll stop shy of forecasting your Wordle attempt. 😉

      1. 🙂 🙂 🙂

        44 will be the chilliest of the season by far. I figured something like that.

        Wordle is a CRAP SHOOT. 🙂 🙂 🙂

        Thank you.

    1. I haven’t seen a praying mantis is so long it isn’t funny.
      I used to catch those in my hands. NEVER hurt them and always released them. They look awesome when flying.

      I’ve seen them in that color and also a vibrant green.

      This is totally fantastic!!!!!

      1. I have not seen one in many years either. I was surprised when I looked up and saw her there. She tried for over an hour to move to the house and when I headed inside she flew away. I have never seen one fly and am sorry I missed it

  7. This has to be one of the most beautiful weather days of 2025.

    If you need warmth, the sun is there. It’s so comfortable. The visibility is endless. It’s not too breezy. Top 3 day of the year weather wise.

    1. Autumn – well it’s technically still summer – is God’s gift to New England. I’ve always said that and I’m not even religious.

      Of course there can be exceptions to the rule. But generally speaking, we have lots of awesome weather in fall.

    2. I’m loving every bit of today too. First long sleeve tee. I don’t really need it but feels good anyway

  9. What a day! I think we might get down to 38-39 hear in the low sheltered valley locations especially with the lack of wind today and clear skies. Let’s see…

    I agree with TK go with less rain later Tuesday PM / Wednesday AM. Yes, I know the 12z ECMWF has gone more robust and slower with the departure of the rain for Tuesday / Wednesday. I am reluctant to think that way. I really don’t like a lot of today’s 12z ECMWF. As whole that model has been pretty good, but its OP run has been a bit too ambitious with its QPF amounts and its Day 7 – Day 15 forecast have been downright bipolar in August and September. Constantly swinging on the 00z to 12z forecasts that are too hot to reasonable outcomes or too cold for highs post frontal passage, and of course some occasional drenchings. Remember 7-10 days ago, tonight into tomorrow was supposed to be quite wet if you looked at a few random ECMWF runs. These swings are complicated by the on going GFS difficulties, but I have been using that one for temps quite a bit. Along with the NAM and HRRR. (Yes, TK, I still use the 12k Nam 🙂 )

    1. Haha – fair! I hardly look at it anymore.

      I’ve been paying attention to the short range HRRR vs RRFS to see which model is strong / weak in each situation, but that’s long, almost never-finished process.

      ECMWF has been Charlie Brown of late (i.e., wishy-washy).

      I am noting a general trend to lessen the well-advertised warm-up late month and early October. In fact, some guidance has some really anomalous cold in eastern Canada and trying dip into the northeastern US in the early days of October.

  11. Wild ending to AL playoff race.

    Tigers are in a big tail spin, Seattle and Houston are playing a series, so Houston also has 70 losses, so in the last couple days, it has changed from solely watching the Guardians to watching the Tigers, Astros, Red Sox, Guardians and even the Mariners.

    I’m shocked about the Tigers with their pitching. I’m stunned how much of a run the Guardians have been on, but that’s what makes baseball fun.

  13. Had a special dinner at a local restaurant with my oldest daughter and her oldest daughter. Three generations. Doesn’t get much better

  17. For sports fans, Pats at 1:00PM, Bruins first exhibition game at 5:00PM, and Sox at 7:30PM.

    Working on today’s update. I went out at sunrise for a walk and just got back. Coffee & breakfast time haha!

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