Tuesday April 21 2026 Forecast (7:04AM)

DAYS 1-5 (APRIL 21-25)

The large scale pattern will be driven by evolving blocking which starts upstream over the Atlantic now. An upper level low that went by our region over the weekend from west to east bringing us showers and t-storms Sunday followed by a breezy, cool day with a few additional showers of rain and frozen precipitation Monday is mostly offshore now. The western extent of this low pressure area is still causing some cloudiness over Cape Cod and the Islands early today, but those will slide to the southeast with time and that area will clear, leaving us with abundant sunshine today under a small high pressure area. Temperatures will remain below normal. Sun quickly dries things out so fire danger is slightly elevated, though less wind (just light wind with coastal sea breezes) will be a limiting factor. As we move from mid through late week, upper level low pressure will sit offshore, even retrograding westward a bit (Thursday) temporarily. Wednesday, an approaching low pressure area from the west will try to push a warm front through, and while it brings a canopy of cloud cover and some precipitation our way, the front never makes it across the region as the larger scale block / upper low to east forces it southeastward, passing southwest of our region then being pulled into the circulation of the offshore upper level low pressure area. The latter will spin its way a little closer to our region Thursday into Friday. Each of these days will see the development of diurnal cumulus and stratocumulus clouds. Thursday will be more unstable so that those clouds can build into scattered showers, especially over eastern portions of our region. Saturday can be somewhat similar, but additionally we’ll likely see some increased high and mid level cloudiness as the next system that tries to approach from the west starts to be force southeastward, like its predecessor. This does mean continued below normal temperatures through the end of this week, but after the shower threat of Thursday, I expect precipitation-free conditions Friday and Saturday.

TODAY: Variably cloudy Cape Cod / Islands morning, otherwise mostly sunny. Highs 45-52, coolest coast. Wind W under 10 MPH early, then variable up to 10 MPH with coastal sea breezes developing.

TONIGHT: Clouding over. Overnight light snow / mix / rain developing from west to east with minor snow accumulation possible on unpaved surfaces, especially west of I-95. Lows 32-39. Wind variable under 10 MPH.

WEDNESDAY: Cloudy. Lingering light rain potential mainly east of I-95 and south of I-90 through midday. Highs 45-52. Wind variable to SE up to 10 MPH.

WEDNESDAY NIGHT: Mostly cloudy. Lows 37-44. Wind SE to NE 5-15 MPH.

THURSDAY: Variably cloudy. Isolated to scattered showers which can be mixed with small hail or graupel. Highs 46-53. Wind NE to N 5-15 MPH.

THURSDAY NIGHT: Partly cloudy. Lows 37-44. Wind NW 5-15 MPH.

FRIDAY: Partly sunny. Highs 52-59. Wind N 5-15 MPH.

FRIDAY NIGHT: Partly cloudy. Lows 35-42. Wind N 5-15 MPH.

SATURDAY: Variably cloudy. Highs 51-58. Wind N 10-20 MPH.

DAYS 6-10 (APRIL 26-30)

Blocking pattern but a slow eastward shift. Temperatures generally below normal. Dry weather to start. One or two wet weather chances follow in the final days of April.

DAYS 11-15 (MAY 1-5)

Blocking remains. Another upper low nearby. Temperatures below normal. Additional unsettled weather in the early days of May.

35 thoughts on “Tuesday April 21 2026 Forecast (7:04AM)”

  1. Good morning and thank yiu TK.

    36 after low of 33

    Ocean: 44

    WORDLE: 3

    Dreadful Spring weather continues. I think I will take a long nap. Please wake me when the weather turns nice, if it ever does.

    Did I ever mention how much I HATE Spring around here? The only good thing about it is that I am still here on this Earth. The older I get the more I appreciate that fact.

    1. You got it. That first word is oh so critical. Today my first word got me nothing. Thankfully my 2nd word yielded a bonanza with 3 letters in position and one out of position effectively giving me 4 in position. Pretty easy from there.

      Hope you are enjoying your vacation down there.

      1. Nice !

        Yes, thanks ! Yesterday, we trekked to the Great Dismal Swamp, a massive protected area of land starting in south-central VA and extends into northern North Carolina.

        Peaceful, some long dirt roads that you drive to get more into the center of the park. Saw a lot of turtles and the scenery was really nice.

          1. Didn’t see any, but at one point, I sure thought I heard one under our truck, after returning from a short walk. I stopped in my tracks and I thought, there’s a loose piece of paper or a bag stuck and getting hit by wind, except it was clear and then I’m like, crap, we’re in this swamp, the next sound it sounded like was the hiss of a snake. But, I never did see it either, so I’m not sure. Let’s just say, I got in the track faster than I ever have, then drove over to get my wife, who doubted my story, lol 🙂 🙂 🙂 🙂 🙂

            1. Cool. Since you were in the Dismal Swamp area, very well could have been a water moccasin (cotton mouth) Or a rattle snake. Good you got out of there. 🙂

    2. I did the same thing on the third guess. I thought of the correct word but then changed my mind. I got it in 4.

      1. Nice 5 and 4

        I got really lucky. One letter not correct position for guess one. Nothing for guess two. Then oddly all but second letter in correct place for third guess. The Wordle gods were with Me.

        Wordle 4.

  2. As above avg as the continental US has been since early March, I think it’s been well below avg in central and eastern Canada.

    Hudson Bay’s ice is in as good a condition as I’ve seen it. And it’s been extra cold in the eastern 2/3rds of Canada.

    So, we know the earth is always trying to balance out the transfer of heat and cold from the equator to the poles (and vise versa) and I do think a period of blocking is almost needed at this point to moderate the higher latitudes a bit from its very, very cold start to spring.

    1. Something had better give.
      Nothing like the 40s In Mid to late April. Oh yeah give me more of that. Love it, not!!

      How about 60? Is that asking for too much? I don’t think so.

      1. I feel the same way !

        As we were settling down last night, someone I ended up on summer outlooks and I haven’t seen many projections in the last 10-20 years of cooler than avg summers in the northeast US, but that theme is growing now. Saw a lot of light blue with avg to below avg summer temps.

        Supported with recent analog years of strong el-ninos. Western Canada, southern US bake and the Great Lakes and northeast have been avg to slightly cooler than avg through summer.

  3. Thank you, TK. Up to 33 from a 27 low.

    Off to have a bit of hand surgery in a couple hours so happy to see sunshine

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