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

Dangerous Heat and Heavy Rainfall into the Weekend

Hot temperatures and high humidity are forecast to continue across the mid-Mississippi Valley into this weekend. Heat Advisories remain in effect. Heavy to excessive rainfall occurring at times through the weekend could bring areas of flooding to parts of the northern Rockies, upper Midwest, central Great Lakes, and southern New England. Read More >

Current conditions at

Fort Belvoir (KDAA)

Lat: 38.72°NLon: 77.18°WElev: 69ft.

A Few Clouds

73°F

23°C

Humidity 80%
Wind Speed S 8 mph
Barometer 29.97 in (1015.1 mb)
Dewpoint 67°F (19°C)
Visibility 10.00 mi
Last update 20 Sep 7:55 am EDT
Extended Forecast for

Accokeek MD

  • Today

    Today: Scattered showers, with thunderstorms also possible after 2pm. Mostly cloudy, with a high near 85. Southwest wind 8 to 10 mph. Chance of precipitation is 30%.

    High: 85 °F

    Scattered
    Showers then
    Scattered
    T-storms

  • Tonight

    Tonight: Showers and thunderstorms likely, mainly before 1am. Cloudy, then gradually becoming partly cloudy, with a low around 65. Light and variable wind. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 65 °F

    Showers
    Likely then
    Chance
    Showers

  • Monday

    Monday: A chance of showers between 2pm and 4pm. Partly sunny, with a high near 76. Northeast wind around 9 mph. Chance of precipitation is 30%.

    High: 76 °F

    Partly Sunny
    then Chance
    Showers

  • Monday Night

    Monday Night: A slight chance of thunderstorms before 8pm, then showers likely and possibly a thunderstorm between 8pm and 11pm, then showers likely after 11pm. Cloudy, with a low around 61. Northeast wind around 8 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 61 °F

    Showers
    Likely

  • Tuesday

    Tuesday: Showers, with thunderstorms also possible after 11am. High near 68. Northeast wind 10 to 13 mph, with gusts as high as 24 mph. Chance of precipitation is 80%.

    High: 68 °F

    Showers

  • Tuesday Night

    Tuesday Night: Showers likely and possibly a thunderstorm before 11pm, then showers likely between 11pm and 2am, then showers likely and possibly a thunderstorm after 2am. Cloudy, with a low around 57. Chance of precipitation is 60%.

    Low: 57 °F

    Showers
    Likely

  • Wednesday

    Wednesday: Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 65. Chance of precipitation is 60%.

    High: 65 °F

    Showers
    Likely

  • Wednesday Night

    Wednesday Night: A chance of showers. Mostly cloudy, with a low around 57. Chance of precipitation is 50%.

    Low: 57 °F

    Chance
    Showers

  • Thursday

    Thursday: A chance of showers. Mostly cloudy, with a high near 65. Chance of precipitation is 40%.

    High: 65 °F

    Chance
    Showers

Detailed Forecast

Today
Scattered showers, with thunderstorms also possible after 2pm. Mostly cloudy, with a high near 85. Southwest wind 8 to 10 mph. Chance of precipitation is 30%.
Tonight
Showers and thunderstorms likely, mainly before 1am. Cloudy, then gradually becoming partly cloudy, with a low around 65. Light and variable wind. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Monday
A chance of showers between 2pm and 4pm. Partly sunny, with a high near 76. Northeast wind around 9 mph. Chance of precipitation is 30%.
Monday Night
A slight chance of thunderstorms before 8pm, then showers likely and possibly a thunderstorm between 8pm and 11pm, then showers likely after 11pm. Cloudy, with a low around 61. Northeast wind around 8 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Tuesday
Showers, with thunderstorms also possible after 11am. High near 68. Northeast wind 10 to 13 mph, with gusts as high as 24 mph. Chance of precipitation is 80%.
Tuesday Night
Showers likely and possibly a thunderstorm before 11pm, then showers likely between 11pm and 2am, then showers likely and possibly a thunderstorm after 2am. Cloudy, with a low around 57. Chance of precipitation is 60%.
Wednesday
Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 65. Chance of precipitation is 60%.
Wednesday Night
A chance of showers. Mostly cloudy, with a low around 57. Chance of precipitation is 50%.
Thursday
A chance of showers. Mostly cloudy, with a high near 65. Chance of precipitation is 40%.
Thursday Night
A slight chance of showers. Mostly cloudy, with a low around 54. Chance of precipitation is 20%.
Friday
A slight chance of showers. Partly sunny, with a high near 66. Chance of precipitation is 20%.
Friday Night
Partly cloudy, with a low around 54.
Saturday
Mostly sunny, with a high near 68.
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ABOUT THIS FORECAST

 
Point Forecast:
Accokeek MD
 38.67°N 77.03°W (Elev. 148 ft)
Last Update:
7:53 am EDT Sep 20, 2026
Forecast Valid:
8am EDT Sep 20, 2026-6pm EDT Sep 26, 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