National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

Fort Belvoir (KDAA)

Lat: 38.72°NLon: 77.18°WElev: 69ft.

Partly Cloudy

79°F

26°C

Humidity 74%
Wind Speed E 3 mph
Barometer 29.87 in (1011.7 mb)
Dewpoint 70°F (21°C)
Visibility 10.00 mi
Heat Index82°F (28°C)
Last update 22 Aug 4:55 pm EDT
Extended Forecast for

Mount Vernon VA

  • This Afternoon

    This Afternoon: Isolated showers and thunderstorms. Mostly cloudy, with a high near 78. East wind around 5 mph. Chance of precipitation is 20%.

    High: 78 °F

    Isolated
    T-storms

  • Tonight

    Tonight: Scattered showers and thunderstorms, mainly after 7pm. Some of the storms could produce heavy rainfall. Mostly cloudy, with a low around 71. Light and variable wind. Chance of precipitation is 50%.

    Low: 71 °F

    Heavy Rain
    then
    Scattered
    Showers

  • Sunday

    Sunday: Mostly sunny, with a high near 85. West wind 5 to 9 mph.

    High: 85 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 67. West wind around 5 mph becoming calm after midnight.

    Low: 67 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 84. West wind 3 to 7 mph.

    High: 84 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 66.

    Low: 66 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 84.

    High: 84 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 67.

    Low: 67 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 87.

    High: 87 °F

    Sunny

Detailed Forecast

This Afternoon
Isolated showers and thunderstorms. Mostly cloudy, with a high near 78. East wind around 5 mph. Chance of precipitation is 20%.
Tonight
Scattered showers and thunderstorms, mainly after 7pm. Some of the storms could produce heavy rainfall. Mostly cloudy, with a low around 71. Light and variable wind. Chance of precipitation is 50%.
Sunday
Mostly sunny, with a high near 85. West wind 5 to 9 mph.
Sunday Night
Mostly clear, with a low around 67. West wind around 5 mph becoming calm after midnight.
Monday
Sunny, with a high near 84. West wind 3 to 7 mph.
Monday Night
Mostly clear, with a low around 66.
Tuesday
Sunny, with a high near 84.
Tuesday Night
Mostly clear, with a low around 67.
Wednesday
Sunny, with a high near 87.
Wednesday Night
A slight chance of showers. Partly cloudy, with a low around 71. Chance of precipitation is 20%.
Thursday
A chance of showers and thunderstorms. Partly sunny, with a high near 86. Chance of precipitation is 50%.
Thursday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 71. Chance of precipitation is 50%.
Friday
A chance of showers and thunderstorms. Mostly sunny, with a high near 86. Chance of precipitation is 30%.
Friday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 72. Chance of precipitation is 30%.
Saturday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 87.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Mount Vernon VA
 38.69°N 77.09°W (Elev. 3 ft)
Last Update:
4:53 pm EDT Aug 22, 2026
Forecast Valid:
5pm EDT Aug 22, 2026-6pm EDT Aug 29, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation