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

36°F

2°C

Humidity 31%
Wind Speed Calm
Barometer 30.01 in (1016.6 mb)
Dewpoint 8°F (-13°C)
Visibility 10.00 mi
Last update 17 Jan 12:52 am EST
Extended Forecast for

Great Falls VA

  • Overnight

    Overnight: Cloudy, with a low around 33. South wind 7 to 9 mph.

    Low: 33 °F

    Cloudy

  • Saturday

    Saturday: A chance of rain and snow before 9am, then a chance of rain and sleet between 9am and noon. Cloudy, then gradually becoming mostly sunny, with a high near 45. South wind 6 to 10 mph becoming west in the afternoon. Winds could gust as high as 24 mph. Chance of precipitation is 50%.

    High: 45 °F

    Chance Wintry
    Mix then
    Partly Sunny

  • Saturday Night

    Saturday Night: Increasing clouds, with a low around 31. Light and variable wind becoming northwest around 5 mph after midnight.

    Low: 31 °F

    Increasing
    Clouds

  • Sunday

    Sunday: A chance of light snow, mainly before 1pm. Mostly cloudy, with a high near 34. Northwest wind 6 to 8 mph. Chance of precipitation is 30%.

    High: 34 °F

    Chance Light
    Snow

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 20. Northwest wind around 6 mph becoming calm in the evening.

    Low: 20 °F

    Partly Cloudy

  • M.L.King Day

    M.L.King Day: Sunny, with a high near 38.

    High: 38 °F

    Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 15.

    Low: 15 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Sunny, with a high near 26.

    High: 26 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 14.

    Low: 14 °F

    Mostly Clear

Detailed Forecast

Overnight
Cloudy, with a low around 33. South wind 7 to 9 mph.
Saturday
A chance of rain and snow before 9am, then a chance of rain and sleet between 9am and noon. Cloudy, then gradually becoming mostly sunny, with a high near 45. South wind 6 to 10 mph becoming west in the afternoon. Winds could gust as high as 24 mph. Chance of precipitation is 50%.
Saturday Night
Increasing clouds, with a low around 31. Light and variable wind becoming northwest around 5 mph after midnight.
Sunday
A chance of light snow, mainly before 1pm. Mostly cloudy, with a high near 34. Northwest wind 6 to 8 mph. Chance of precipitation is 30%.
Sunday Night
Partly cloudy, with a low around 20. Northwest wind around 6 mph becoming calm in the evening.
M.L.King Day
Sunny, with a high near 38.
Monday Night
Partly cloudy, with a low around 15.
Tuesday
Sunny, with a high near 26.
Tuesday Night
Mostly clear, with a low around 14.
Wednesday
Mostly sunny, with a high near 39.
Wednesday Night
Mostly cloudy, with a low around 29.
Thursday
Partly sunny, with a high near 43.
Thursday Night
Mostly cloudy, with a low around 24.
Friday
Mostly sunny, with a high near 36.
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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:
12:53 am EST Jan 17, 2026
Forecast Valid:
1am EST Jan 17, 2026-6pm EST Jan 23, 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