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

Washington/Dulles International Airport, DC (KIAD)

Lat: 38.93°NLon: 77.45°WElev: 312ft.

Mostly Cloudy

84°F

29°C

Humidity 61%
Wind Speed NE 9 mph
Barometer 29.91 in (1012.7 mb)
Dewpoint 69°F (21°C)
Visibility 10.00 mi
Heat Index88°F (31°C)
Last update 13 Aug 6:52 pm EDT
Extended Forecast for

Great Falls VA

  • Tonight

    Tonight: Mostly cloudy, with a low around 72. Northwest wind around 6 mph becoming calm in the evening.

    Low: 72 °F

    Mostly Cloudy

  • Friday

    Friday: A chance of showers, with thunderstorms also possible after 5pm. Mostly cloudy, with a high near 85. Light north wind. Chance of precipitation is 30%.

    High: 85 °F

    Partly Sunny
    then Chance
    Showers

  • Friday Night

    Friday Night: A chance of showers and thunderstorms before 10pm, then a chance of showers after 2am. Patchy fog between 1am and 3am. Otherwise, mostly cloudy, with a low around 70. Light north wind. Chance of precipitation is 50%.

    Low: 70 °F

    Chance
    T-storms then
    Chance
    Showers and
    Patchy Fog

  • Saturday

    Saturday: A chance of showers, mainly before 8am. Partly sunny, with a high near 84. North wind 3 to 5 mph. Chance of precipitation is 30%.

    High: 84 °F

    Chance
    Showers

  • Saturday Night

    Saturday Night: A chance of showers after 2am. Mostly cloudy, with a low around 70. South wind 3 to 5 mph. Chance of precipitation is 40%.

    Low: 70 °F

    Partly Cloudy
    then Chance
    Showers

  • Sunday

    Sunday: A chance of showers, with thunderstorms also possible after 2pm. Mostly cloudy, with a high near 88. Chance of precipitation is 50%.

    High: 88 °F

    Chance
    Showers then
    Chance
    T-storms

  • Sunday Night

    Sunday Night: A chance of showers and thunderstorms before 2am. Mostly cloudy, with a low around 73. Chance of precipitation is 50%.

    Low: 73 °F

    Chance
    T-storms

  • Monday

    Monday: A chance of showers between 8am and 2pm, then a chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 87. Chance of precipitation is 50%.

    High: 87 °F

    Chance
    Showers then
    Chance
    T-storms

  • Monday Night

    Monday Night: A chance of thunderstorms before 8pm. Partly cloudy, with a low around 70. Chance of precipitation is 30%.

    Low: 70 °F

    Chance
    T-storms then
    Partly Cloudy

Detailed Forecast

Tonight
Mostly cloudy, with a low around 72. Northwest wind around 6 mph becoming calm in the evening.
Friday
A chance of showers, with thunderstorms also possible after 5pm. Mostly cloudy, with a high near 85. Light north wind. Chance of precipitation is 30%.
Friday Night
A chance of showers and thunderstorms before 10pm, then a chance of showers after 2am. Patchy fog between 1am and 3am. Otherwise, mostly cloudy, with a low around 70. Light north wind. Chance of precipitation is 50%.
Saturday
A chance of showers, mainly before 8am. Partly sunny, with a high near 84. North wind 3 to 5 mph. Chance of precipitation is 30%.
Saturday Night
A chance of showers after 2am. Mostly cloudy, with a low around 70. South wind 3 to 5 mph. Chance of precipitation is 40%.
Sunday
A chance of showers, with thunderstorms also possible after 2pm. Mostly cloudy, with a high near 88. Chance of precipitation is 50%.
Sunday Night
A chance of showers and thunderstorms before 2am. Mostly cloudy, with a low around 73. Chance of precipitation is 50%.
Monday
A chance of showers between 8am and 2pm, then a chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 87. Chance of precipitation is 50%.
Monday Night
A chance of thunderstorms before 8pm. Partly cloudy, with a low around 70. Chance of precipitation is 30%.
Tuesday
Mostly sunny, with a high near 85.
Tuesday Night
Partly cloudy, with a low around 69.
Wednesday
Mostly sunny, with a high near 86.
Wednesday Night
Partly cloudy, with a low around 71.
Thursday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 90. Chance of precipitation is 20%.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Great Falls VA
 39.01°N 77.29°W (Elev. 348 ft)
Last Update:
4:53 pm EDT Aug 13, 2026
Forecast Valid:
7pm EDT Aug 13, 2026-6pm EDT Aug 20, 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