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.

Fair

62°F

17°C

Humidity 56%
Wind Speed N 8 mph
Barometer 29.96 in (1014.4 mb)
Dewpoint 46°F (8°C)
Visibility 10.00 mi
Last update 19 May 11:52 pm EDT
Extended Forecast for

Great Falls VA

  • Overnight

    Overnight: Mostly clear, with a low around 49. North wind around 6 mph.

    Low: 49 °F

    Mostly Clear

  • Tuesday

    Tuesday: Increasing clouds, with a high near 70. North wind around 6 mph.

    High: 70 °F

    Increasing
    Clouds

  • Tuesday Night

    Tuesday Night: Showers, mainly after 2am. Low around 55. Calm wind becoming southeast around 6 mph after midnight. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 55 °F

    Chance
    Showers then
    Showers

  • Wednesday

    Wednesday: Showers. High near 60. Southeast wind around 11 mph, with gusts as high as 18 mph. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.

    High: 60 °F

    Showers

  • Wednesday Night

    Wednesday Night: Showers and possibly a thunderstorm. Low around 53. East wind 5 to 9 mph. Chance of precipitation is 80%.

    Low: 53 °F

    Showers

  • Thursday

    Thursday: Showers, mainly after 2pm. High near 66. Chance of precipitation is 80%.

    High: 66 °F

    Chance
    Showers then
    Showers

  • Thursday Night

    Thursday Night: Showers, mainly before 8pm. Low around 52. Chance of precipitation is 80%.

    Low: 52 °F

    Showers then
    Chance
    Showers

  • Friday

    Friday: A chance of showers. Mostly sunny, with a high near 64. Chance of precipitation is 40%.

    High: 64 °F

    Chance
    Showers

  • Friday Night

    Friday Night: Partly cloudy, with a low around 49.

    Low: 49 °F

    Partly Cloudy

Detailed Forecast

Overnight
Mostly clear, with a low around 49. North wind around 6 mph.
Tuesday
Increasing clouds, with a high near 70. North wind around 6 mph.
Tuesday Night
Showers, mainly after 2am. Low around 55. Calm wind becoming southeast around 6 mph after midnight. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.
Wednesday
Showers. High near 60. Southeast wind around 11 mph, with gusts as high as 18 mph. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.
Wednesday Night
Showers and possibly a thunderstorm. Low around 53. East wind 5 to 9 mph. Chance of precipitation is 80%.
Thursday
Showers, mainly after 2pm. High near 66. Chance of precipitation is 80%.
Thursday Night
Showers, mainly before 8pm. Low around 52. Chance of precipitation is 80%.
Friday
A chance of showers. Mostly sunny, with a high near 64. Chance of precipitation is 40%.
Friday Night
Partly cloudy, with a low around 49.
Saturday
Mostly sunny, with a high near 67.
Saturday Night
Mostly clear, with a low around 50.
Sunday
Sunny, with a high near 71.
Sunday Night
Partly cloudy, with a low around 53.
Memorial Day
A chance of showers. Partly sunny, with a high near 73. Chance of precipitation is 30%.
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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:
10:30 pm EDT May 19, 2025
Forecast Valid:
12am EDT May 20, 2025-6pm EDT May 26, 2025
 
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