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D.C. area forecast: Humid through midweek as storm chances slowly rise

Today’s Daily Digit

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

A sure step down from the weekend with elevating humidity, but could be worse.

Express Forecast

Today: Mostly cloudy, slight p.m. shower chance. Highs: Mid-80s.

Tonight: Mostly cloudy. Lows: 66-71.

Tomorrow: Partly sunny, slight p.m. storm chance. Highs: Upper 80s.


Radar & lightning: Latest D.C. area 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.

Our extended reprieve from heat and humidity fades away as we begin a new week, but while the air is increasingly muggy, it could be a lot worse in late July.  We’ll be hard pressed to break 90 this week.  Still, the air will be plenty juicy to support thunderstorm chances especially Wednesday and Thursday when a cold front edges through the region.  The air may dry out some Friday and Saturday before the next front threatens Sunday.

Today (Monday): It’s a lot like Sunday: mostly cloudy with occasional patches of blue.  Humidity ticks up slightly (dew points upper 60s) and a stray shower or thundershower could develop – but most of us stay dry. Highs are mostly in the mid-80s, with winds from the east around 5 mph. ConfidenceMedium-High

Tonight: Any showers or thundershowers fade before sunset.  Skies remain cloudier than not, with lows around 70 downtown and mid-to-upper 60s in our cooler suburbs. Winds are light from the southeast. Confidence: Medium-High

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

Tomorrow (Tuesday): We lose the easterly (from the ocean) wind, increasing sunshine a bit as well as temperatures.  Highs reach the seasonable upper 80s. Factoring in high humidity, it feels as hot as 90-95.  There’s around a 25 percent chance of late afternoon and evening storms.   Winds are from the south around 5-10 mph. Confidence: Medium-High

Tomorrow night: Any storms fade by/around sunset. Skies are partly cloudy and it’s rather muggy.  Lows range from the upper 60s in our cooler suburbs  to the mid-70s downtown. Light winds from the south. Confidence: Medium-High


Wednesday and Thursday both bring humidity and healthy storm chances before the responsible cold front finally pushes off to our southeast Thursday night.   The chance of storms is slightly higher Thursday (60 percent) compared to Wednesday (40 percent). A few storms could be severe – either day (slightly higher chance of severe Thursday).  Highs both days should be 85-90 with moderately high humidity. Lows are in the upper 60s to mid-70s (downtown) Wednesday night falling to the low 60s to upper 60s (downtown) Thursday night. Confidence: Medium-High

Friday and Saturday should be the two most comfortable days of the week with the least chance of rain (although there’s an outside chance of lingering storms Friday in our southeastern suburbs).  Highs both days should be in the low-to-mid 80s with humidity levels falling back into the moderate range (dew points around 60).   Overnight lows should range through the 60s. Confidence: Medium

Sunday‘s forecast is a challenge; it depends on the timing of a cold front heading into the region.  If the cold front arrives sooner, showers and storms could be possible throughout the day, starting early.  If it slows down, the rain threat could hold off until the evening. Either way, highs are likely in the 80s with an increase in humidity. Confidence: Low-Medium

Jason is the Washington Post’s weather editor and Capital Weather Gang's chief meteorologist. He earned a master's degree in atmospheric science, and spent 10 years as a climate change science analyst for the U.S. government. He holds the Digital Seal of Approval from the National Weather Association.
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