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

Severe Thunderstorm and Heavy Rainfall Threat Tonight; Heat Continues on Tuesday Across the Eastern U.S.

Severe weather and flash flooding threats continue across the Central Plains and Midwest into tonight. Very large hail, strong tornadoes and damaging winds are expected. An early season heat wave will continue to challenge temperature records across the eastern U.S. through Wednesday. Read More >

Current conditions at

Fort Belvoir (KDAA)

Lat: 38.72°NLon: 77.18°WElev: 69ft.

Fair

83°F

28°C

Humidity 61%
Wind Speed Calm
Barometer 30.06 in (1018.2 mb)
Dewpoint 68°F (20°C)
Visibility 10.00 mi
Heat Index86°F (30°C)
Last update 18 May 7:55 pm EDT
Extended Forecast for

Mount Vernon VA

  • Tonight

    Tonight: Mostly clear, with a low around 72. South wind around 6 mph.

    Low: 72 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 96. Southwest wind 5 to 10 mph.

    High: 96 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 74. Southwest wind around 8 mph.

    Low: 74 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Showers likely and possibly a thunderstorm after 2pm. Increasing clouds, with a high near 94. Southwest wind 5 to 9 mph. Chance of precipitation is 70%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 94 °F

    Sunny then
    Showers
    Likely

  • Wednesday Night

    Wednesday Night: Showers and possibly a thunderstorm before 2am, then showers likely. Low around 59. North wind 5 to 7 mph. Chance of precipitation is 80%.

    Low: 59 °F

    Showers

  • Thursday

    Thursday: Showers likely, mainly before 2pm. Mostly cloudy, with a high near 69. Chance of precipitation is 60%.

    High: 69 °F

    Showers
    Likely

  • Thursday Night

    Thursday Night: A chance of showers. Mostly cloudy, with a low around 54. Chance of precipitation is 50%.

    Low: 54 °F

    Chance
    Showers

  • Friday

    Friday: Showers likely. Mostly cloudy, with a high near 66. Chance of precipitation is 70%.

    High: 66 °F

    Showers
    Likely

  • Friday Night

    Friday Night: Showers. Low around 54. Chance of precipitation is 80%.

    Low: 54 °F

    Showers

Detailed Forecast

Tonight
Mostly clear, with a low around 72. South wind around 6 mph.
Tuesday
Sunny, with a high near 96. Southwest wind 5 to 10 mph.
Tuesday Night
Partly cloudy, with a low around 74. Southwest wind around 8 mph.
Wednesday
Showers likely and possibly a thunderstorm after 2pm. Increasing clouds, with a high near 94. Southwest wind 5 to 9 mph. Chance of precipitation is 70%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Wednesday Night
Showers and possibly a thunderstorm before 2am, then showers likely. Low around 59. North wind 5 to 7 mph. Chance of precipitation is 80%.
Thursday
Showers likely, mainly before 2pm. Mostly cloudy, with a high near 69. Chance of precipitation is 60%.
Thursday Night
A chance of showers. Mostly cloudy, with a low around 54. Chance of precipitation is 50%.
Friday
Showers likely. Mostly cloudy, with a high near 66. Chance of precipitation is 70%.
Friday Night
Showers. Low around 54. Chance of precipitation is 80%.
Saturday
Showers likely. Mostly cloudy, with a high near 72. Chance of precipitation is 70%.
Saturday Night
Showers likely. Mostly cloudy, with a low around 59. Chance of precipitation is 60%.
Sunday
Showers likely. Mostly cloudy, with a high near 77. Chance of precipitation is 60%.
Sunday Night
Showers likely. Mostly cloudy, with a low around 61. Chance of precipitation is 60%.
Memorial Day
A chance of showers. Mostly cloudy, with a high near 78. Chance of precipitation is 50%.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Mount Vernon VA
 38.72°N 77.11°W (Elev. 36 ft)
Last Update:
7:53 pm EDT May 18, 2026
Forecast Valid:
9pm EDT May 18, 2026-6pm EDT May 25, 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