D.C. area forecast: Muggy start to week, magnificent middle, cloudy end?

Today’s Daily Digit

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

5
Not our finest August day. Very warm and humid, slight shower chance too.

Express Forecast

Today: Variably cloudy, humid – slight shower chance. Highs: 85-90.

Tonight: Slight shower chance, mostly cloudy and warm. Lows: 68-73.

Tomorrow: Mostly cloudy, 50% chance showers/storms. Highs: 81-86.

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.

If we can just make it through Tuesday, the payoff Wednesday through Friday is HUGE. The humid 80s and shower chances of the next two days are replaced by spectacular 70s with low humidity.  The weekend may be mixed, as moisture tries to increase from the south, especially by Sunday.

Today (Monday): There may be some patchy fog when you get up and head out.  Then, we should have partly sunny skies with highs into the mid-to-upper 80s.  Moderate-to-high humidity levels push heat indices to 90 or higher. A shower or thundershower is possible (20 percent chance), mainly in the afternoon – but most of us are dry. Winds are light from the west. Confidence: Medium-High

Tonight: There’s a 30-40 percent chance of showers and/or thundershowers overnight as a cold front draws closer.  Mostly cloudy skies make meteor shower viewing tough.  Lows are in the upper 60s to low 70s (downtown). Confidence: Medium-High

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

Tomorrow (Tuesday): A cold front swinging the region presents a 50-60 percent chance of showers and storms.  A few may put down some heavy rain and strong winds, but severe weather is likely confined to areas well southeast of the District.  Highs reach the low-to-mid 80s with partly to mostly cloudy skies and moderately high humidity.  Winds are light from the southwest. Confidence: Medium-High

Tomorrow night: Showers and storms diminish during the evening, followed by clearing skies.  You’ll notice cooler, less humid air streaming in late at night, with lows 60-66 (suburbs-city). Confidence: Medium-High

A LOOK AHEAD

Wednesday through Friday are simply sublime. Canadian high pressure builds in from the northwest with delightfully cooler than normal air and low humidity.  Highs each day range from 75-80, with overnight lows mostly in the 50s to near 60 (downtown). Skies are clear to partly cloudy although I can’t rule out a more significant increase in clouds by the second half of Friday as some moisture tries build into the area from the south. Confidence: Medium-High

Friday night and Saturday may bring some increase in clouds but I’m thinking any rain remains to the southeast (chance of rain showers 25 percent).  It remains cooler than normal, with lows around 60 and highs mostly in the 70s to near 80. Confidence: Low-Medium

By Sunday, the chance of showers increases (50 percent chance) as a stronger surge of moisture tries to come in from the south.  There’s even an outside possibility moisture from a tropical system originating in the Gulf of Mexico may get drawn northward – but lots of question marks about that right now.  Despite these rainier scenarios, the day could still turn out OK if high pressure holds the moisture to our south.  Highs are probably close to 80. Confidence: Low

Also on Capital Weather Gang

D.C. area forecast: Just a few spotty showers for our Sunday