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Washington DC weather for July 21: warm and humid with clouds and sun

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Brian's exclusive forecast for Washington DC:

This afternoon: Varying amounts of clouds and sunshine with a slight chance of a thundershower. The high will be in the lower 80s.

Tonight: Mostly cloudy with a low in the lower 70s.

Tuesday: Warm and humid with varying amounts of clouds and sunshine. The high will be in the mid 80s.

The extended forecast calls for warm and humid conditions on Wednesday with a low around 70 and the high will be in the upper 80s. Widespread thunderstorms on Thursday with a low around 70 and a high in the mid 80s. Becoming sunny and less humid on Friday with a low in the upper 60s and a high in the lower 80s. Sunshine on Saturday with a low in the mid 60s and a high in the mid 80s. Clouds and sun on Sunday with a low in the mid 60s and a high in the mid 80s.

Weather Summary

High pressure off the coast of New England will create an onshore flow of air over the Mid Atlantic states today. This will result in considerable cloudiness and areas of morning fog, but most areas will remain dry throughout the day. Temperatures in the lower 70s this morning will reach the lower 80s this afternoon. More sunshine is expected this afternoon, but considerable cloudiness can be expected as the high brings an easterly wind over the region. There is a slight chance of a thundershower this afternoon or evening, but most areas will remain dry. Thunderstorm chances increase on Wednesday and Thursday as a cold front approaches Baltimore and Washington from the west. Warm, but less humid, conditions return on Friday and Saturday in the wake of the cold front.

Regional Weather Information

Baltimore average lows and highs

Washington average lows and highs

National Weather Service daily weather discussion

Baltimore/Washington National Weather Service

Chesapeake Bay marine forecast

Mid-Atlantic radar loop

For more weather updates, please visit my web site www.chesapeakebayweather.com, my Chesapeake Bay Weather page on Facebook, and if you're heading to Ocean City feel free to check out my Ocean City MD Weather page on Facebook. You can also follow me on Twitter @chesbayweather.

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