D.C. area forecast: A serene final weekend of September

12:30 p.m. update: After morning sunshine across the central part of the area, clouds have generally thickened this afternoon. The wedge wins again? It appears we’ll end up cloudier than forecast from here out, though some breaks are possible through the afternoon. In retrospect, confidence for today probably should have been medium which would have kept the Nice Day stamp put away. Temps are still quite pleasant at least!

Today’s Daily Digit

A somewhat subjective rating of the days weather, on a scale of 1 to 10.

9
Worst part of this pattern is running out of new ways to say it’s a great time to be outside.

Express Forecast

Today: Partly sunny. Highs: Low-to-mid 70s.

Tonight: Partly to mostly clear. Lows: Near 50 to upper 50s.

Tomorrow: Partly to mostly sunny. Highs: Low-to-mid 70s.

FORECAST IN DETAIL

With average highs currently in the mid-70s, and lows in the upper 50s, this stretch of insanely delightful conditions can be expected to persist historically. In the current forecast, there’s not much in the way of us living up to those expectations. As with yesterday, some clouds on a cool breeze off the Atlantic might be around. But probably not as numerous.

nice day
Today (Saturday): We should see more in the way of sunshine than yesterday, but with a wind continuing to blow in from the ocean, it could be cloudier at times as well — perhaps mostly in the morning. Either way, I do think we’ll eke out enough sunshine to meet Nice Day criteria. The easterly/northeasterly fetch around 5 mph helps keep highs in the low-to-mid 70s most spots. Confidence: Medium-High

Tonight: After temperatures head into the 60s around sunset, skies are partly to mostly clear through the night. Lows are mainly in the 50s, with a spread from near 50 in the coolest spots to the upper 50s downtown. Clouds may increase by morning. Confidence: Medium-High

For related traffic news, check out Dr. Gridlock. Keep reading for the forecast through the weekend…

nice day
Tomorrow (Sunday): Not much change here. With high pressure still off to the northeast, and an ocean storm to the east, those marine winds continue. Cloudiest times should be in the morning, turning partly to mostly sunny by the afternoon. We keep a light northeast wind going during the day — not too noticeable though. Highs? Low-to-mid 70s. Confidence: Medium-High

Tomorrow night: Take tonight, and repeat. Just a few clouds float by as temperatures fall to lows in the low 50s in the cooler suburbs to near 60 in the D.C. heat island. Confidence: Medium-High

A LOOK AHEAD

By Monday we should start to kick the oceanic wind influence a bit, yet not enough to make for a much different day than what we’ve become accustomed to. Under mostly sunny skies, highs should reach for the mid-70s most spots, probably a notch warmer than the weekend. Confidence: Medium

Tuesday may bring additional warming to the area. High pressure to the south tries to build north as a system out west also aides in warm-air transport. These factors should help send highs to the mid-and-upper 70s, and give us some partly to mostly sunny conditions.Confidence: Medium

Ian Livingston is a forecaster/photographer and information lead for the Capital Weather Gang. By day, Ian is a defense and national security researcher at a D.C. think tank.
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47
90-degree days year-to-date
Yearly Average
36
Record Most
67 (1980,2010)
Record Fewest
7 (1886,1905)
Last Year
24

At a Glance

Thu.

partlycloudyday
75° /94°

Fri.

thunderstorms
76° /87°
Drop 30%

Sat.

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69° /84°

Sun.

partlycloudyday
67° /84°

Mon.

partlycloudyday
69° /87°

Tue.

partlycloudyday
71° /90°
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Jason Samenow · September 27, 2013

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