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

59°F

15°C

Humidity 67%
Wind Speed SW 9 mph
Barometer 29.78 in (1008.3 mb)
Dewpoint 48°F (9°C)
Visibility 10.00 mi
Last update 20 Mar 10:52 pm EDT
Extended Forecast for

Great Falls VA

  • Tonight

    Tonight: Showers and possibly a thunderstorm before 2am, then isolated showers between 2am and 3am. Low around 49. Southwest wind 7 to 9 mph. Chance of precipitation is 80%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 49 °F

    Showers

  • Saturday

    Saturday: Mostly sunny, with a high near 65. North wind 6 to 9 mph.

    High: 65 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 46. East wind around 6 mph becoming south after midnight.

    Low: 46 °F

    Partly Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 79. Southwest wind 6 to 11 mph, with gusts as high as 22 mph.

    High: 79 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: Scattered showers before 11pm, then scattered showers and thunderstorms between 11pm and 2am, then showers likely and possibly a thunderstorm after 2am. Mostly cloudy, with a low around 52. Southwest wind 6 to 10 mph. Chance of precipitation is 60%.

    Low: 52 °F

    Scattered
    Showers then
    Showers
    Likely

  • Monday

    Monday: Showers likely, mainly before 8am. Partly sunny, with a high near 62. Chance of precipitation is 60%.

    High: 62 °F

    Showers
    Likely then
    Scattered
    Showers

  • Monday Night

    Monday Night: Mostly clear, with a low around 34.

    Low: 34 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 51.

    High: 51 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 38.

    Low: 38 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Showers and possibly a thunderstorm before 2am, then isolated showers between 2am and 3am. Low around 49. Southwest wind 7 to 9 mph. Chance of precipitation is 80%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Saturday
Mostly sunny, with a high near 65. North wind 6 to 9 mph.
Saturday Night
Partly cloudy, with a low around 46. East wind around 6 mph becoming south after midnight.
Sunday
Partly sunny, with a high near 79. Southwest wind 6 to 11 mph, with gusts as high as 22 mph.
Sunday Night
Scattered showers before 11pm, then scattered showers and thunderstorms between 11pm and 2am, then showers likely and possibly a thunderstorm after 2am. Mostly cloudy, with a low around 52. Southwest wind 6 to 10 mph. Chance of precipitation is 60%.
Monday
Showers likely, mainly before 8am. Partly sunny, with a high near 62. Chance of precipitation is 60%.
Monday Night
Mostly clear, with a low around 34.
Tuesday
Sunny, with a high near 51.
Tuesday Night
Mostly cloudy, with a low around 38.
Wednesday
Mostly cloudy, with a high near 55.
Wednesday Night
Partly cloudy, with a low around 38.
Thursday
Mostly sunny, with a high near 63.
Thursday Night
A chance of rain. Mostly cloudy, with a low around 46. Chance of precipitation is 40%.
Friday
A chance of rain. Partly sunny, with a high near 59. Chance of precipitation is 40%.
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ABOUT THIS FORECAST

 
Point Forecast:
Great Falls VA
 38.99°N 77.32°W (Elev. 351 ft)
Last Update:
10:53 pm EDT Mar 20, 2026
Forecast Valid:
11pm EDT Mar 20, 2026-6pm EDT Mar 27, 2026
 
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Additional Resources

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High Temperature

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Chance of Precipitation