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.

Overcast

37°F

3°C

Humidity 48%
Wind Speed SE 9 mph
Barometer 30.32 in (1026.8 mb)
Dewpoint 19°F (-7°C)
Visibility 10.00 mi
Wind Chill30°F (-1°C)
Last update 18 Mar 10:52 pm EDT
Extended Forecast for

Great Falls VA

  • Tonight

    Tonight: Mostly cloudy, with a low around 31. Southeast wind around 5 mph.

    Low: 31 °F

    Mostly Cloudy

  • Thursday

    Thursday: Partly sunny, with a high near 54. South wind around 6 mph.

    High: 54 °F

    Partly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 39. Calm wind.

    Low: 39 °F

    Partly Cloudy

  • Friday

    Friday: A slight chance of showers after 2pm. Partly sunny, with a high near 63. Calm wind becoming south 5 to 8 mph in the afternoon. Chance of precipitation is 20%.

    High: 63 °F

    Mostly Sunny
    then Slight
    Chance
    Showers

  • Friday Night

    Friday Night: Showers likely, mainly between 8pm and 2am. Mostly cloudy, with a low around 50. South wind around 8 mph. Chance of precipitation is 60%.

    Low: 50 °F

    Showers
    Likely

  • Saturday

    Saturday: A chance of showers before 8am. Partly sunny, with a high near 68. Chance of precipitation is 30%.

    High: 68 °F

    Chance
    Showers then
    Partly Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 47.

    Low: 47 °F

    Mostly Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 72.

    High: 72 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: A chance of rain after 8pm. Mostly cloudy, with a low around 46. Chance of precipitation is 40%.

    Low: 46 °F

    Chance Rain

Detailed Forecast

Tonight
Mostly cloudy, with a low around 31. Southeast wind around 5 mph.
Thursday
Partly sunny, with a high near 54. South wind around 6 mph.
Thursday Night
Partly cloudy, with a low around 39. Calm wind.
Friday
A slight chance of showers after 2pm. Partly sunny, with a high near 63. Calm wind becoming south 5 to 8 mph in the afternoon. Chance of precipitation is 20%.
Friday Night
Showers likely, mainly between 8pm and 2am. Mostly cloudy, with a low around 50. South wind around 8 mph. Chance of precipitation is 60%.
Saturday
A chance of showers before 8am. Partly sunny, with a high near 68. Chance of precipitation is 30%.
Saturday Night
Mostly cloudy, with a low around 47.
Sunday
Partly sunny, with a high near 72.
Sunday Night
A chance of rain after 8pm. Mostly cloudy, with a low around 46. Chance of precipitation is 40%.
Monday
Partly sunny, with a high near 55.
Monday Night
Mostly cloudy, with a low around 31.
Tuesday
Partly sunny, with a high near 49.
Tuesday Night
Mostly cloudy, with a low around 34.
Wednesday
Partly sunny, with a high near 58.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Great Falls VA
 39.01°N 77.29°W (Elev. 348 ft)
Last Update:
10:53 pm EDT Mar 18, 2026
Forecast Valid:
11pm EDT Mar 18, 2026-6pm EDT Mar 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