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

Areas of Extreme Heat and Excessive Rainfall Potential

Dangerous and extreme heat will remain across portions of the central U.S. this week, persisting across the mid to lower Mississippi Valley, Gulf Coast, southern Plains and portions of Texas. A heat wave over the Southwest U.S. will peak this weekend. Heavy to excessive rainfall may produce flash flooding from the Delmarva Peninsula north into the Hudson Valley today and tonight. Read More >

Hazardous Weather Conditions

Current conditions at

Fort Belvoir (KDAA)

Lat: 38.72°NLon: 77.18°WElev: 69ft.

A Few Clouds

88°F

31°C

Humidity 55%
Wind Speed S 8 G 18 mph
Barometer 29.53 in (1000.2 mb)
Dewpoint 70°F (21°C)
Visibility 10.00 mi
Heat Index93°F (34°C)
Last update 28 Jul 3:55 pm EDT
Extended Forecast for

3 Miles S Mount Vernon VA

Severe T-storm Watch until July 28, 10:00pm
Click here for hazard details and duration
Severe T-storm Watch
  •  
    Severe T-storm Watch until July 28, 10:00pm

    NOW until 10:00pm Tue

    Severe T-storm Watch

  • This Afternoon

    High: 83 °F

    Severe
    Thunderstorms

  • Tonight

    Tonight: Showers and thunderstorms, mainly before 9pm. Some of the storms could be severe. Low around 71. South wind 5 to 8 mph becoming northwest after midnight. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 71 °F

    Severe
    Thunderstorms
    then Clear

  • Wednesday

    Wednesday: Sunny, with a high near 82. Northwest wind 9 to 13 mph, with gusts as high as 22 mph.

    High: 82 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 71. Northwest wind around 10 mph.

    Low: 71 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 82. Northwest wind around 11 mph, with gusts as high as 22 mph.

    High: 82 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 70.

    Low: 70 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 84.

    High: 84 °F

    Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 71.

    Low: 71 °F

    Partly Cloudy

Detailed Forecast

This Afternoon
Showers and thunderstorms. Some of the storms could be severe. High near 83. Southwest wind around 9 mph. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Tonight
Showers and thunderstorms, mainly before 9pm. Some of the storms could be severe. Low around 71. South wind 5 to 8 mph becoming northwest after midnight. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Wednesday
Sunny, with a high near 82. Northwest wind 9 to 13 mph, with gusts as high as 22 mph.
Wednesday Night
Partly cloudy, with a low around 71. Northwest wind around 10 mph.
Thursday
Mostly sunny, with a high near 82. Northwest wind around 11 mph, with gusts as high as 22 mph.
Thursday Night
Mostly clear, with a low around 70.
Friday
Sunny, with a high near 84.
Friday Night
Partly cloudy, with a low around 71.
Saturday
Partly sunny, with a high near 87.
Saturday Night
A slight chance of showers and thunderstorms before 2am. Mostly cloudy, with a low around 73. Chance of precipitation is 20%.
Sunday
A chance of showers and thunderstorms. Mostly cloudy, with a high near 86. Chance of precipitation is 50%.
Sunday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 73. Chance of precipitation is 50%.
Monday
A chance of showers and thunderstorms. Partly sunny, with a high near 87. Chance of precipitation is 30%.
Monday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 73. Chance of precipitation is 30%.
Tuesday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 89.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
3 Miles S Mount Vernon VA
 38.67°N 77.09°W (Elev. 7 ft)
Last Update:
2:23 pm EDT Jul 28, 2026
Forecast Valid:
4pm EDT Jul 28, 2026-6pm EDT Aug 4, 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