Monday May 12 2025 Forecast (7:09AM)

27 Comments

DAYS 1-5 (MAY 12-16)

A slow transition of the spring weather pattern continues over the next several days. Last week’s omega block (low West, high Plains, low East), as noted on yesterday’s blog post, transitioned to a rex block pattern (high North, low South). We’re currently under the influence of high pressure, but as we move through this week, the large scale features shift and the high slides to the east while the low to the south drifts northeastward, our way. However, there will be resistance from the high and the overall process will be quite slow to occur. This means that while we see an increase in clouds after today’s abundant sun, the clouds will struggle to thicken up into midweek, and any rain will be held at bay to our south and west as well. Finally by Thursday and Friday as we see the now broad and weaker upper low move further northeast, we’ll see a trend to a more southerly air flow and as a result more moisture with lots of clouds and increased shower chances. Neither of these days look like full on rainy “wash-out” kind of days though.

TODAY: Clouds scoot across southeastern NH / northeastern MA early on, otherwise abundant sunshine. Highs 60-67 Cape Cod / South Coast, 68-75 elsewhere. Wind W to SW 5-15 MPH.

TONIGHT: High clouds fan in from the southwest. Lows 48-55. Wind SW to variable under 10 MPH.

TUESDAY: Sun & high clouds. Highs 63-70 coast, 70-77 inland. Wind variable up to 10 MPH with coastal sea breezes.

TUESDAY NIGHT: High clouds increase. Lows 50-57. Wind SE up to 10 MPH.

WEDNESDAY: Limited sunshine / lots of clouds. Highs 60-67 coast, 67-74 inland. Wind SE up to 10 MPH.

WEDNESDAY NIGHT: Mostly cloudy. Lows 52-59. Wind SE up to 10 MPH.

THURSDAY: Mostly cloudy. Chance of showers. Highs 64-71, coolest coastal areas. Wind SE up to 10 MPH.

THURSDAY NIGHT: Mostly cloudy. Chance of showers. Lows 53-60. Wind S up to 10 MPH.

FRIDAY: Mostly cloudy. Chance of showers. Highs 63-70, coolest South Coast. Wind S 5-15 MPH.

DAYS 6-10 (MAY 17-21)

Continued slow pattern shift as upper level low pressure dominates but the core of which passes to our west then north. This starts us out in a southerly air flow which then trends more westerly. There are shower chances early in the period, the May 17-18 weekend, before a drying trend takes place. Temperatures near to slightly above normal for the period overall.

DAYS 11-15 (MAY 22-26)

Late month pattern features a broad trough of low pressure and mostly west to east flow, with a trend for more cool air from Canada – i.e., temperatures near to below normal, with mostly dry weather interrupted by brief shower chances. Memorial Day Weekend is May 24-26 as part of this expected pattern.

27 thoughts on “Monday May 12 2025 Forecast (7:09AM)”

  2. Good morning and thank uiu TK.

    Down to 43 here this morning and has recovered to 48.

    Anothe beauty on tap.

  3. Thanks TK !

    In Dec-early Feb, the sun itself hasn’t even risen when I leave at 7am.

    Today, the sun has not only cleared the neighbor’s house, its nearly cleared a tall tree in their yard.

    Very helpful on the clear days.

  5. Thanks TK.

    Thankful for great weather, my youngest is trying 13 and he loves Kendrick Lamar so happy the forecast worked out.

  8. JP Dave, while we might think of Greenland in traditional terms, such as Eskimo wearing mukluk boots and living in igloos, the vast majority of Greenlanders don’t live this way. Greenland is fairly affluent, and Nuuk, Greenland is actually a very modern-looking small city. It even now has an airport fully capable of accommodating large jets.

    Fish remains the biggest export item.

    Greenland conducts a lot of trade with Denmark (and has received large amounts of assistance over the years) to which still technically belongs (though the island is an autonomous territory with its own parliament and system of government).

      1. Whatever Greenland’s got, Trump has great interest. I learned recently that President Truman was considering it as U.S. territory.

        1. It isn’t ours, PERIOD. I don’t care what that DING DONG thinks!!!! The man should be in an INSANE ASYLUM!!!!

  12. Lots of blue on the map 6-10 & 8-14, including New England for both periods. Cool times ahead!

    1. And lots of green on that map as well. Wet times ahead also?

      I’ll be one of those “social media” types and start to wonder if wet weekends are going to be a habit this upcoming summer. 😉

      In other words, dry weekdays/wet weekends.

      1. Not a really high percentage for the above normal precip.

        We had our wettest pattern the first 10 days of May. It’s more “typical” from here on – spring variability, but less persistent wetness.

        And no, not all the weekends are wet, nor have they been. That’s a media over-blow. They’re literally counting “a few showers” on several of those days as “wet weekends”. That’s not correct.

        Odds favor precipitation of at least a trace on 1 out of of 3 days in a normal precip pattern, 2 out of 3 days in a wet precip pattern. Weather doesn’t know weekdays vs. weekends. That’s something we came up with, and made it statistically significant. It’s actually statistically meaningless other than for our own selfish purposes. 😉

        And yes, the social media hype-sters will be at it. You can count on that. 🙂

    1. Temp forecast range worked out well today… 60-67 S Cst. 68-75 elsewhere. But there were a few spots that just made it beyond 75. Always such a range in the spring around here. It’s hard to forecast for it without having a forecast that looks like “I have no idea what to forecast…high temps 33-90…that should cover it!”

        1. It’s not really going to be too bad this week. We do have more ocean breeze that will work in, but it won’t be overwhelming for the most part. Once we get to Friday, it’s a warmer southerly air flow.

        2. I could take today and yesterday every day of every north ex elf November to March. Then. I’d like snow

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