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

49°F

9°C

Humidity 100%
Wind Speed Calm
Barometer 29.80 in (1008.9 mb)
Dewpoint 49°F (9°C)
Visibility 10.00 mi
Last update 21 Mar 5:52 am EDT
Extended Forecast for

Great Falls VA

  • Today

    Today: Mostly sunny, with a high near 65. North wind around 7 mph.

    High: 65 °F

    Mostly Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 48. East wind around 6 mph becoming south after midnight.

    Low: 48 °F

    Partly Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 81. Southwest wind 6 to 10 mph, with gusts as high as 18 mph.

    High: 81 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: A chance of rain before 11pm, then a chance of rain and thunderstorms between 11pm and 2am, then rain likely and possibly a thunderstorm after 2am. Increasing clouds, with a low around 51. Southwest wind around 9 mph becoming northwest after midnight. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 51 °F

    Chance Rain
    then Rain
    Likely

  • Monday

    Monday: Rain likely, mainly before 8am. Partly sunny, with a high near 57. North wind around 15 mph, with gusts as high as 24 mph. Chance of precipitation is 60%.

    High: 57 °F

    Rain Likely
    then Chance
    Rain

  • Monday Night

    Monday Night: Mostly clear, with a low around 32.

    Low: 32 °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

  • Wednesday

    Wednesday: Partly sunny, with a high near 59.

    High: 59 °F

    Partly Sunny

Detailed Forecast

Today
Mostly sunny, with a high near 65. North wind around 7 mph.
Tonight
Partly cloudy, with a low around 48. East wind around 6 mph becoming south after midnight.
Sunday
Partly sunny, with a high near 81. Southwest wind 6 to 10 mph, with gusts as high as 18 mph.
Sunday Night
A chance of rain before 11pm, then a chance of rain and thunderstorms between 11pm and 2am, then rain likely and possibly a thunderstorm after 2am. Increasing clouds, with a low around 51. Southwest wind around 9 mph becoming northwest after midnight. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Monday
Rain likely, mainly before 8am. Partly sunny, with a high near 57. North wind around 15 mph, with gusts as high as 24 mph. Chance of precipitation is 60%.
Monday Night
Mostly clear, with a low around 32.
Tuesday
Sunny, with a high near 51.
Tuesday Night
Mostly cloudy, with a low around 38.
Wednesday
Partly sunny, with a high near 59.
Wednesday Night
Mostly cloudy, with a low around 43.
Thursday
Partly sunny, with a high near 65.
Thursday Night
A chance of rain. Mostly cloudy, with a low around 48. Chance of precipitation is 50%.
Friday
A chance of rain. Partly sunny, with a high near 58. 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:
4:53 am EDT Mar 21, 2026
Forecast Valid:
6am EDT Mar 21, 2026-6pm EDT Mar 27, 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