D.C. area forecast: Rain risks on the way down as heat prepares to build in

Today’s Daily Digit

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

Any rain shouldn’t be too prolonged. Plus more sun. Plus Saturday. I’ll take it!

Express Forecast

Today: Variably cloudy. Showers possible. Highs: 82-87.

Tonight: Partly to mostly cloudy. Lows: Upper 60s to low 70s.

Tomorrow: Partly cloudy. Iso p.m. storm? Highs: Upper 80s to low 90s.


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.

Sitting right in the middle of the hottest period of the year on average, we should probably expect fewer days with highs in the 70s like yesterday and more days with highs in the 90s (even above??). That seems to be exactly what we get as we head deeper into the days ahead. But first, a not-too-shabby Saturday and a pretty benignly warm — as far as summer goes — Sunday. Hopefully the rain is kept to a minimum… a break would be nice.

Today (Saturday): There should be a good deal more sunshine than recent days as low pressure pulls further off to the west (weird, right?) and high pressure also noses in from the east. Abundant moisture still yields periods of cloudiness though, and perhaps some scattered showers/t’showers (40% chance) at times. Highs are in the 80s, largely between about 82 and 87. Any tiny respite we had in dew points ends as they head back to and past 70 on winds from the southeast. Confidence: Medium-High

Tonight: Skies are partly cloudy and it’s pretty classic July: muggy and mild. With a south wind continuing to feed moisture into the region, lows only get to about 70 in the cooler spots and mid-70s downtown. There could be an isolated passing shower.
Confidence: Medium-High

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

Tomorrow (Sunday): The upper-level ridge builds in quickly from the east, which should bring our rain threat down and our sun + heat threat up. Cloudiest times should be early, with sun increasing with daylight hours as highs rise to the upper 80s and lower 90s. Despite the overall increase in sunshine, heat and humidity may combine to produce an isolated to widely scattered (20% chance) thunderstorm in the afternoon. Confidence: Medium

Tomorrow night: After a slight risk of an evening storm, skies are partly to mostly clear. The air mass is still warming up, so there’s no reason to go below a near 70 to mid-70 range for lows. Confidence: Medium


Summer, summer, summertime… That should be the theme of the week, as I suppose it should be around now. On Monday, temperatures continue their climb, with highs ranging from near 90 to the mid-90s under partly sunny skies. Humidity shows no sign of any real relent either. This type of pattern tends to send some storms to us from the northwest from time to time, so a daily risk of that might start as soon as Monday. Confidence: Medium

By Tuesday the heat regime is further in power. It rules over us with at least partial sunshine and temperatures shooting for the mid-90s, perhaps higher. Late-day thunderstorms may threaten as well, though from this range it’s just a slight chance. 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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Ian Livingston · July 12, 2013

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