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

37°F

3°C

Humidity 46%
Wind Speed W 3 mph
Barometer 30.14 in (1020.9 mb)
Dewpoint 18°F (-8°C)
Visibility 10.00 mi
Last update 12 Mar 9:52 pm EDT
Extended Forecast for

Herndon VA

  • Tonight

    Tonight: Mostly clear, with a low around 30. West wind 5 to 7 mph becoming light and variable after midnight.

    Low: 30 °F

    Mostly Clear

  • Friday

    Friday: Mostly sunny, with a high near 54. Breezy, with a south wind 7 to 12 mph increasing to 18 to 23 mph in the afternoon. Winds could gust as high as 39 mph.

    High: 54 °F

    Mostly Sunny
    then Mostly
    Sunny and
    Breezy

  • Friday Night

    Friday Night: Mostly clear, with a low around 39. Southwest wind 10 to 17 mph, with gusts as high as 31 mph.

    Low: 39 °F

    Mostly Clear

  • Saturday

    Saturday: Mostly sunny, with a high near 55. West wind 10 to 14 mph, with gusts as high as 22 mph.

    High: 55 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 40. Northeast wind around 5 mph becoming light and variable.

    Low: 40 °F

    Mostly Cloudy

  • Sunday

    Sunday: Mostly cloudy, with a high near 60.

    High: 60 °F

    Mostly Cloudy

  • Sunday Night

    Sunday Night: Showers. Low around 53. Chance of precipitation is 80%.

    Low: 53 °F

    Showers

  • Monday

    Monday: Showers, with thunderstorms also possible after 2pm. High near 69. Breezy. Chance of precipitation is 90%.

    High: 69 °F

    Showers and
    Breezy

  • Monday Night

    Monday Night: Showers and possibly a thunderstorm before 8pm, then a chance of showers between 8pm and 2am. Low around 29. Chance of precipitation is 80%.

    Low: 29 °F

    Showers then
    Chance
    Showers

Detailed Forecast

Tonight
Mostly clear, with a low around 30. West wind 5 to 7 mph becoming light and variable after midnight.
Friday
Mostly sunny, with a high near 54. Breezy, with a south wind 7 to 12 mph increasing to 18 to 23 mph in the afternoon. Winds could gust as high as 39 mph.
Friday Night
Mostly clear, with a low around 39. Southwest wind 10 to 17 mph, with gusts as high as 31 mph.
Saturday
Mostly sunny, with a high near 55. West wind 10 to 14 mph, with gusts as high as 22 mph.
Saturday Night
Mostly cloudy, with a low around 40. Northeast wind around 5 mph becoming light and variable.
Sunday
Mostly cloudy, with a high near 60.
Sunday Night
Showers. Low around 53. Chance of precipitation is 80%.
Monday
Showers, with thunderstorms also possible after 2pm. High near 69. Breezy. Chance of precipitation is 90%.
Monday Night
Showers and possibly a thunderstorm before 8pm, then a chance of showers between 8pm and 2am. Low around 29. Chance of precipitation is 80%.
Tuesday
Mostly sunny, with a high near 39.
Tuesday Night
Mostly clear, with a low around 24.
Wednesday
Mostly sunny, with a high near 42.
Wednesday Night
Partly cloudy, with a low around 30.
Thursday
Mostly cloudy, with a high near 49.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Herndon VA
 38.97°N 77.38°W (Elev. 354 ft)
Last Update:
9:17 pm EDT Mar 12, 2026
Forecast Valid:
10pm EDT Mar 12, 2026-6pm EDT Mar 19, 2026
 
Forecast Discussion
 
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Additional Resources

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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