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

Excessive Rainfall and Significant Flooding in the Upper Midwest This Weekend

Heavy to excessive rainfall is expected over the weekend across eastern Iowa, northern Missouri, northwest Illinois and southern Wisconsin. Numerous flash floods, some with significant impacts, are expected in these areas. Heaviest rainfall will occur overnight Saturday and Sunday, so be sure to have multiple ways to receive warnings. Read More >

Current conditions at

Fort Belvoir (KDAA)

Lat: 38.72°NLon: 77.18°WElev: 69ft.

Fair

60°F

16°C

Humidity 94%
Wind Speed Calm
Barometer 30.21 in (1023.3 mb)
Dewpoint 58°F (14°C)
Visibility 10.00 mi
Last update 10 Aug 12:55 am EDT
Extended Forecast for

2 Miles ESE Accokeek MD

  • Overnight

    Overnight: Patchy fog before 4am, then patchy fog after 5am. Otherwise, clear, with a low around 59. Calm wind.

    Low: 59 °F

    Patchy Fog

  • Sunday

    Sunday: Patchy fog before 9am. Otherwise, sunny, with a high near 85. Calm wind becoming east around 5 mph in the afternoon.

    High: 85 °F

    Patchy Fog
    then Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 63. Southeast wind around 5 mph becoming calm in the evening.

    Low: 63 °F

    Mostly Clear

  • Monday

    Monday: Patchy fog before 8am. Otherwise, mostly sunny, with a high near 87. Calm wind becoming southeast around 5 mph in the afternoon.

    High: 87 °F

    Patchy Fog
    then Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 67. Southeast wind around 6 mph becoming calm after midnight.

    Low: 67 °F

    Mostly Clear

  • Tuesday

    Tuesday: A slight chance of showers after 2pm. Mostly sunny, with a high near 90. Chance of precipitation is 20%.

    High: 90 °F

    Mostly Sunny
    then Slight
    Chance
    Showers

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 71.

    Low: 71 °F

    Mostly Clear

  • Wednesday

    Wednesday: A chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 93. Chance of precipitation is 30%.

    High: 93 °F

    Mostly Sunny
    then Chance
    T-storms

  • Wednesday Night

    Wednesday Night: A chance of showers and thunderstorms before 8pm. Mostly cloudy, with a low around 72. Chance of precipitation is 30%.

    Low: 72 °F

    Chance
    T-storms then
    Partly Cloudy

Detailed Forecast

Overnight
Patchy fog before 4am, then patchy fog after 5am. Otherwise, clear, with a low around 59. Calm wind.
Sunday
Patchy fog before 9am. Otherwise, sunny, with a high near 85. Calm wind becoming east around 5 mph in the afternoon.
Sunday Night
Mostly clear, with a low around 63. Southeast wind around 5 mph becoming calm in the evening.
Monday
Patchy fog before 8am. Otherwise, mostly sunny, with a high near 87. Calm wind becoming southeast around 5 mph in the afternoon.
Monday Night
Mostly clear, with a low around 67. Southeast wind around 6 mph becoming calm after midnight.
Tuesday
A slight chance of showers after 2pm. Mostly sunny, with a high near 90. Chance of precipitation is 20%.
Tuesday Night
Mostly clear, with a low around 71.
Wednesday
A chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 93. Chance of precipitation is 30%.
Wednesday Night
A chance of showers and thunderstorms before 8pm. Mostly cloudy, with a low around 72. Chance of precipitation is 30%.
Thursday
A chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 91. Chance of precipitation is 40%.
Thursday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 71. Chance of precipitation is 30%.
Friday
A chance of showers. Mostly sunny, with a high near 89. Chance of precipitation is 30%.
Friday Night
A chance of showers. Partly cloudy, with a low around 70. Chance of precipitation is 30%.
Saturday
A chance of showers. Mostly sunny, with a high near 88. Chance of precipitation is 30%.
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ABOUT THIS FORECAST

 
Point Forecast:
2 Miles ESE Accokeek MD
 38.66°N 76.98°W (Elev. 144 ft)
Last Update:
1:29 am EDT Aug 10, 2025
Forecast Valid:
1am EDT Aug 10, 2025-6pm EDT Aug 16, 2025
 
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Additional Resources

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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