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Posted at 10:45 AM ET, 07/ 8/2009

Forecast: Still Waiting for Summer Heat, Humidity

By Dan Stillman

Very low humidity today; more humid this weekend

* Fireworks Photo Spread | Later: Does El Nino = Fewer Hurricanes? *


Today: Mostly sunny. Low-to-mid 80s. | Tonight: Partly cloudy. 57-64. | Tomorrow: Partly sunny. Low 80s. Isolated p.m. shower? | A Look Ahead


Those waiting for this summer's other shoe to drop -- the usually inevitable onset of persistent heat and humidity -- will have to wait at least a couple more days. Both temperatures and humidity will continue below average today and tomorrow. Even afterward, there's no extended streak of 90-degree weather in our immediate future, though more humid air looks to move in for Friday and the weekend.

Today (Wednesday): Mostly sunny skies will be nice as will highs in the low-to-mid 80s. But the nicest part of today?... the refreshingly dry air thanks to a pleasant light breeze from the north and northwest. We're talking dew points in the low-to-mid 50s, when low 60s is often the best we can hope for this time of year. (What's dew point?) Confidence: High

Tonight: Partly cloudy skies with light winds and overnight lows in the low-to-mid 60s downtown, upper 50s to near 60 in the burbs. Confidence: Medium-High

Keep reading for the forecast through the weekend....

Forecast map for Thursday. Courtesy NOAA.

Tomorrow (Thursday): Light onshore breezes from the northeast -- courtesy clockwise flow around high pressure to our north and counterclockwise flow around low pressure to the south -- should increase the humidity from Wednesday, yet overall we'll still be less humid than what's typical for early-to-mid July. Highs? In the lovely low 80s under partly sunny skies and with a slight chance of an isolated afternoon shower. Confidence: Medium-High

Tomorrow Night: A quiet weather night: Partly cloudy with lows in the 60s. Confidence: Medium-High


Friday presents a fantastic finale to the work week as partly sunny skies lift highs toward the mid-80s. Can't rule out an isolated afternoon thunderstorm, and you may start to notice some more humid air working its way in during the latter part of the day. Confidence: Medium-High

The weather turns, well, July-like for the weekend. Both days should be partly sunny and at least moderately humid with highs near 90. A few showers or thunderstorms could crop up around the area each day. As of now, chances are around 30% that you'll run into one or two wherever you happen to be. Confidence: Medium

By Dan Stillman  | July 8, 2009; 10:45 AM ET
Categories:  Forecasts  
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Wow -- 49-degree dew points at Dulles and BWI. Feels pretty awesome out there.

Posted by: Dan-CapitalWeatherGang | July 8, 2009 10:25 AM | Report abuse

This is nearly unprecedented for Washington, D.C....but I'm suspicious the "much-needed-rain" crowd will be back here whining if it keeps up for a while. I've been hearing that our abundance of rain is raising concerns about potato/tomato blight...the cause of the Irish potato famine, since the famine years during the 1840's were marked by very rainy summers in Ireland.

To be frank, it would be great if the heat & humidity held off until after Labor Day.

Posted by: Bombo47jea | July 8, 2009 12:50 PM | Report abuse

Bombo, all the gardeners want is reasonably even soil moisture. Ironically, the very rainy start to the growing season is causing plants to react to the past couple of dry-ish weeks as if we were in a drought! Roots are close to the surface, because water has previously been abundant, and so a week of no rain is really causing such plants to droop.

I do (as a human being existing in the local area) appreciate the lower temps and humidity, but I also like the changes in conditions that make up 'weather'.

Posted by: fsd50 | July 8, 2009 11:47 PM | Report abuse

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