D.C. area forecast: Trending warmer with climbing humidity and shower chances

Today’s Daily Digit

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

5
Clouds/showers disrupt our beautiful August, but temperatures still cooler-than-normal.

Express Forecast

Today: Mostly cloudy. Scattered showers/storms. Highs: 77-81.

Tonight: Cloudy, possible shower. Lows: 66-70.

Tomorrow: Cloudy, showers. Highs: 78-83.

FORECAST IN DETAIL


Radar & lightning: Latest regional radar shows movement of precipitation and lightning strikes over past two hours. Refresh page to update. Click here or on image to enlarge. Or see radar bigger on our Weather Wall.

Hello humidity.  Our nice streak of pleasant, dry weather ends today with increasing cloud cover and shower chances.  It still won’t feel all that bad since temperatures remain cooler-than-normal, but the slow intrusion of humidity makes Wednesday through Friday a bit more uncomfortable.  A cool front cavalry gallops in by  Saturday, bringing back a low-humidity, high-sunshine kind of day by Sunday.

Today (Tuesday): Clouds crowd our skies today, limiting sunshine as they bring in some showers and maybe a few storms. Showers are possible at any time, but late morning to late afternoon appears to be the most likely window.

We’re not expecting a major soaking with mainly a trace to quarter inch expected, but locally heavier amounts are possible.  Highs reach into the upper 70s to low 80s.  Light winds from the south at mainly 5 to 10 mph. Humidity slowly creeps higher, but only to about moderate levels by the afternoon as the dew point lifts up through the 60s.  Confidence: Medium

Tonight: Scattered mainly evening showers turn to a low risk by late evening into the overnight (30%).  The higher humidity and cloud cover keep lows warmer again though unfortunately, so our AC-free weather takes a breather.  Lows range from the upper 60s to around 70 in the city with light winds from the south.  Confidence: Medium

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

Tomorrow (Wednesday): Cloudy again with showers and storms a bit more likely, especially in the afternoon (70%) as highs reach up to the upper 70s and low 80s again. Most spots managing a degree or two warmer than the day before.  Humidity is still creeping higher with moderate to edge-of-high humidity (dew points reaching up to the mid- to upper 60s). Precipitation totals look scattered and inconsistent with some areas more toward a trace and others maybe a tenth to a quarter inch. Winds again blow from the south, pumping in those higher humidity levels. Confidence: Medium

Tomorrow night: Partly to mostly cloudy with scattered showers and maybe a thunderstorm (40% chance).  Lows in the upper 60s to low 70s.  Confidence: Medium

A LOOK AHEAD

Thursday should continue the warm and humid feel as temperatures push a bit higher into the middle 80s under partly to mostly cloudy skies.  Humidity is also at moderate to slightly higher levels as we still see a 60% threat of showers and storms mainly in the afternoon.  Thursday night is probably more on the cloudy side too with a 40% risk of showers and storms as lows are in the muggier low to middle 70s.  Confidence: Medium

Friday is the last full day before the cold front passage, and as a result, we could see a strong enough flow from the south and west to push temperatures near or slightly above 90 degrees under partly cloudy skies.  A 60% chance of showers and storms in the afternoon into evening could keep the peak temperatures temporary at least, but this looks like the hottest day of August so far.  Friday night sees a continued 60% risk of showers and storms with temperatures only dropping to the low-to-middle 70s.  Confidence: Low-Medium

The weekend brings the cold front (finally!) on either Saturday morning or around midday with possible attendant showers or a storm (40% risk again).  The morning looks mostly cloudy, but the sun should break out by the afternoon behind the front as humidity gradually declines.  There is a risk the cold front trends a bit slower such that the afternoon stays on the cloudier side too.

Much improved weather is expected Saturday night with temperatures dropping back into more comfortable 60s under just a few clouds.  Sunday looks like our best chance for another Nice Day status with low-to-mid 80s, mostly sunny skies, and low humidity. Confidence: Low-Medium (due to cold front timing)

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Heat Tracker

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° /95°
Drop 30%

Fri.

thunderstorms
76° /88°
Drop 30%

Sat.

partlycloudyday
69° /84°

Sun.

partlycloudyday
67° /84°

Mon.

partlycloudyday
69° /87°

Tue.

partlycloudyday
71° /90°
National Airport
Dulles
BWI

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Matt Rogers · August 6, 2013

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