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

66°F

19°C

Humidity 29%
Wind Speed SE 12 G 22 mph
Barometer 29.88 in (1011.8 mb)
Dewpoint 33°F (1°C)
Visibility 10.00 mi
Last update 19 Mar 7:52 pm EDT
Extended Forecast for

3 Miles SSW Herndon VA

  • Tonight

    Tonight: Mostly cloudy, with a low around 49. South wind 9 to 13 mph, with gusts as high as 21 mph.

    Low: 49 °F

    Mostly Cloudy

  • Thursday

    Thursday: Showers, mainly after 2pm. High near 69. South wind 10 to 15 mph, with gusts as high as 24 mph. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.

    High: 69 °F

    Chance
    Showers then
    Showers

  • Thursday Night

    Thursday Night: Showers, mainly before 2am. Low around 36. Breezy, with a northwest wind 11 to 20 mph, with gusts as high as 39 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 36 °F

    Showers and
    Breezy

  • Friday

    Friday: Sunny, with a high near 56. Breezy, with a northwest wind 21 to 23 mph, with gusts as high as 44 mph.

    High: 56 °F

    Sunny and
    Breezy

  • Friday Night

    Friday Night: Partly cloudy, with a low around 38. Northwest wind 5 to 9 mph becoming southwest after midnight.

    Low: 38 °F

    Partly Cloudy

  • Saturday

    Saturday: Partly sunny, with a high near 63.

    High: 63 °F

    Partly Sunny

  • Saturday Night

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

    Low: 34 °F

    Mostly Clear

  • Sunday

    Sunday: Mostly sunny, with a high near 56.

    High: 56 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 43.

    Low: 43 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Mostly cloudy, with a low around 49. South wind 9 to 13 mph, with gusts as high as 21 mph.
Thursday
Showers, mainly after 2pm. High near 69. South wind 10 to 15 mph, with gusts as high as 24 mph. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.
Thursday Night
Showers, mainly before 2am. Low around 36. Breezy, with a northwest wind 11 to 20 mph, with gusts as high as 39 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.
Friday
Sunny, with a high near 56. Breezy, with a northwest wind 21 to 23 mph, with gusts as high as 44 mph.
Friday Night
Partly cloudy, with a low around 38. Northwest wind 5 to 9 mph becoming southwest after midnight.
Saturday
Partly sunny, with a high near 63.
Saturday Night
Mostly clear, with a low around 34.
Sunday
Mostly sunny, with a high near 56.
Sunday Night
Mostly cloudy, with a low around 43.
Monday
Showers likely. Mostly cloudy, with a high near 65. Chance of precipitation is 60%.
Monday Night
A chance of showers. Partly cloudy, with a low around 40. Chance of precipitation is 40%.
Tuesday
Partly sunny, with a high near 56.
Tuesday Night
Partly cloudy, with a low around 35.
Wednesday
Mostly sunny, with a high near 54.
Click Map For Forecast
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Map Legend

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles SSW Herndon VA
 38.93°N 77.42°W (Elev. 308 ft)
Last Update:
7:30 pm EDT Mar 19, 2025
Forecast Valid:
8pm EDT Mar 19, 2025-6pm EDT Mar 26, 2025
 
Forecast Discussion
 
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Additional Resources

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation