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Washington DC weather for August 18: mostly cloudy with a few showers

Brian's exclusive forecast for Washington DC:

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

Tonight: Mostly cloudy with scattered light showers. The low will be around 70.

Tuesday: Varying amounts of clouds and sunshine with scattered showers and thundershowers. The high will be around 80.

Tuesday Night: Mostly cloudy wit scattered light showers. The low will be around 70.

Wednesday: Varying amounts of clouds and sunshine with scattered showers and thundershowers. The high will be in the lower 80s.

The extended outlook calls for a good chance of thundershowers on Thursday with lows around 70 and highs around 80. Clouds and sun on Friday with lows in the mid 60s and highs in the mid to upper 70s. Clouds and sun on Saturday with lows in the mid 60s and highs in the upper 70s. Clouds and sun on Monday with a low in the mid 60s and a high in the upper 70s.

Weather Summary

The weather pattern early this week will be influenced by a stationary frontal system across southern Virginia. Areas of low pressure will move along the boundary and will bring showers to the region, but more particularly across central and southeastern Virginia as well as southern Maryland and the lower Eastern Shore. Later in the week, the front will be further suppressed to the south due to high pressure over New England that will reinforce unseasonably mild air over the Middle Atlantic region with highs only in the mid to upper 70s by Friday and Saturday.

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.