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

Heavy Rainfall in the Southern Plains and Mississippi Valley; Thunderstorms in Eastern Colorado on Thursday

A multiple day heavy rainfall event will begin to set up from the Southern Plains into the Mississippi Valley Thursday, peaking in intensity over the holiday weekend. Widely scattered thunderstorms are expected to develop across eastern Colorado Thursday afternoon and evening. Large hail will be the primary hazard. Read More >

Current conditions at

Fort Belvoir (KDAA)

Lat: 38.72°NLon: 77.18°WElev: 69ft.

Mostly Cloudy

70°F

21°C

Humidity 94%
Wind Speed Calm
Barometer 30.04 in (1017.5 mb)
Dewpoint 68°F (20°C)
Visibility 9.00 mi
Last update 21 May 4:55 am EDT
Extended Forecast for

2 Miles SE Accokeek MD

  • Today

    Today: A chance of showers, with thunderstorms also possible after 2pm. Cloudy, with a high near 66. Northeast wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 30%.

    High: 66 °F

    Chance
    Showers

  • Tonight

    Tonight: Showers and thunderstorms likely before 9pm, then a chance of showers. Cloudy, with a low around 53. Northeast wind around 7 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 53 °F

    Showers
    Likely

  • Friday

    Friday: Showers. High near 62. East wind 8 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 62 °F

    Showers

  • Friday Night

    Friday Night: Showers. Low around 50. East wind 7 to 9 mph. Chance of precipitation is 90%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 50 °F

    Showers

  • Saturday

    Saturday: Showers, with thunderstorms also possible after 2pm. High near 63. East wind around 10 mph. Chance of precipitation is 90%.

    High: 63 °F

    Showers

  • Saturday Night

    Saturday Night: Showers and possibly a thunderstorm before 2am, then a chance of showers. Low around 55. Chance of precipitation is 90%.

    Low: 55 °F

    Showers

  • Sunday

    Sunday: A chance of showers before 8am, then a chance of showers after 2pm. Mostly cloudy, with a high near 75. Chance of precipitation is 30%.

    High: 75 °F

    Chance
    Showers

  • Sunday Night

    Sunday Night: A chance of showers before 8pm, then a chance of showers after 2am. Mostly cloudy, with a low around 61. Chance of precipitation is 30%.

    Low: 61 °F

    Chance
    Showers

  • Memorial Day

    Memorial Day: Showers likely, mainly after 2pm. Mostly cloudy, with a high near 79. Chance of precipitation is 60%.

    High: 79 °F

    Chance
    Showers then
    Showers
    Likely

Detailed Forecast

Today
A chance of showers, with thunderstorms also possible after 2pm. Cloudy, with a high near 66. Northeast wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 30%.
Tonight
Showers and thunderstorms likely before 9pm, then a chance of showers. Cloudy, with a low around 53. Northeast wind around 7 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Friday
Showers. High near 62. East wind 8 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.
Friday Night
Showers. Low around 50. East wind 7 to 9 mph. Chance of precipitation is 90%. New precipitation amounts of less than a tenth of an inch possible.
Saturday
Showers, with thunderstorms also possible after 2pm. High near 63. East wind around 10 mph. Chance of precipitation is 90%.
Saturday Night
Showers and possibly a thunderstorm before 2am, then a chance of showers. Low around 55. Chance of precipitation is 90%.
Sunday
A chance of showers before 8am, then a chance of showers after 2pm. Mostly cloudy, with a high near 75. Chance of precipitation is 30%.
Sunday Night
A chance of showers before 8pm, then a chance of showers after 2am. Mostly cloudy, with a low around 61. Chance of precipitation is 30%.
Memorial Day
Showers likely, mainly after 2pm. Mostly cloudy, with a high near 79. Chance of precipitation is 60%.
Monday Night
Showers likely, mainly before 2am. Mostly cloudy, with a low around 63. Chance of precipitation is 60%.
Tuesday
A chance of showers. Mostly cloudy, with a high near 79. Chance of precipitation is 40%.
Tuesday Night
A chance of showers. Mostly cloudy, with a low around 63. Chance of precipitation is 40%.
Wednesday
Partly sunny, with a high near 81.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
2 Miles SE Accokeek MD
 38.66°N 76.98°W (Elev. 144 ft)
Last Update:
4:53 am EDT May 21, 2026
Forecast Valid:
5am EDT May 21, 2026-6pm EDT May 27, 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