D.C. area forecast: A steamy, stagnant start to week; finer and fresher later on

* Code orange air quality alert: Unhealthy for sensitive groups *

Today’s Daily Digit

A somewhat subjective rating of the day’s weather, on a scale of 1 to 10.

5
Muggy upper 80s are pretty much par for the course in early August.

Express Forecast

Today: Partly sunny, humid. Isolated shower possible late. Highs: 86-90.

Tonight: Partly cloudy. Lows: 65-72.

Tomorrow: Partly sunny, humid. Isolated shower/t’storm. Highs: 86-90.

FORECAST IN DETAIL

Temperature Map

Temperatures: Latest D.C. area temperature map. See interactive map on our Weather Wall.

We’re into the thick of the dog days of summer and the next few days have that feel. The air is hot, humid, and a bit stagnant at times. Fortunately, and in keeping with the character of this summer, it’s nothing too extreme. By midweek, a cool front mixes things up a bit, with showers and storms, and then some less humid air by late in the work week. Late Friday and/or Saturday, a disturbance sweeping by may bring a period of rain or may pass safely south.

Today (Monday): This is your typical D.C. mid-summer day: partly sunny, very warm, humid, and a bit hazy (code orange air quality). I can’t rule out an isolated late afternoon or evening shower or thundershower (15 percent chance), but most of us stay dry. Highs are in the upper 80s with moderate to high humidity (dew points mostly in the mid-60s). Winds are light. Confidence: Medium-High

Tonight:  The air is still (essentially no wind) and thick, but not oppressive and even pleasant at a leisurely pace.  Lows range from the mid-60s in our cooler suburbs to the low 70s downtown. Confidence: Medium-High

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

Tomorrow (Tuesday): It’s a lot like today: very warm and a bit muggy. Late day thundershower chances tick up slightly – with odds around 25 percent. Winds once again are very light, so air quality may again be a bit compromised given lack of mixing. Highs reach the upper 80s under partly sunny skies in most spots. Confidence: Medium-High

Tomorrow night: A evening thundershower is possible (20 percent chance). Otherwise, skies are partly cloudy, with lows from the mid-to-upper 60s in our cooler suburbs to the low 70s downtown. Calm winds. Confidence: Medium-High

A LOOK AHEAD

Very warm and humid Wednesday, but a cool front approaching the region may bring a round of showers and storms (50/50 chance) to break the heat. Highs are in the upper 80s.  A few showers and storms may linger after dark Wednesday night, with lows mostly in the 60s.  Confidence: Medium-High

Assuming Wednesday’s front pushes sufficiently south and east, we should have increasing sunshine and lower humidity Thursday. I’m leaning that way but must mention a lingering 20 percent chance of showers and storms, mainly east and southeast of I-95. Highs should range from 82-86. Mostly clear and pleasant Thursday nights, with lows from the upper 50s in our cooler suburbs to the mid-60s downtown. Confidence: Medium-High

High pressure to the north of the region has a chance to give us a beautiful Friday-Sunday period, with partly to mostly sunny skies, low humidity and highs in the low-to-mid 80s (mostly clear nights with lows in the mid-50s to mid-60s).  However, if this high pressure system is weak and caves a bit, a disturbance may sweep through and produce a period of rain and storms – probably Saturday – although some modeling brings it in as soon as Friday. We’re favoring the nicer/drier scenario, but stay tuned to forecasts. Confidence: Low-Medium

Jason is currently the Washington Post’s weather editor. A native Washingtonian, Jason has been a weather enthusiast since age 10.
Continue reading 10 minutes left
Comments
Show Comments

Washington, D.C., Snow Tracker

Current Snow Total
18.3"
Record Most Snow
(2009-10)
56.1"
Record Least Snow
(1997-98, 1972-73)
0.1"
Last Winter's Snow Total
32.0"
Most Read Local
Next Story
Jason Samenow · August 4, 2014