National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

Washington/Dulles International Airport, DC (KIAD)

Lat: 38.93°NLon: 77.45°WElev: 312ft.

Overcast

31°F

-1°C

Humidity 43%
Wind Speed NE 9 mph
Barometer 30.26 in (1024.9 mb)
Dewpoint 11°F (-12°C)
Visibility 10.00 mi
Wind Chill23°F (-5°C)
Last update 5 Dec 1:52 am EST
Extended Forecast for

Herndon VA

Winter Weather Advisory December 5, 04:00am until December 5, 04:00pm
Click here for hazard details and duration
Winter Weather Advisory

  • Overnight

    Overnight: Snow, mainly after 3am. Low around 21. East wind around 6 mph. Chance of precipitation is 80%. Total nighttime snow accumulation of less than a half inch possible.

    Low: 21 °F

    Snow

  • Friday

    Friday: Snow, mainly before 8am. High near 32. East wind around 5 mph becoming calm in the afternoon. Chance of precipitation is 80%. New snow accumulation of less than a half inch possible.

    High: 32 °F

    Snow then
    Slight Chance
    Snow

  • Friday Night

    Friday Night: Patchy fog before 1am, then patchy fog after 2am. Otherwise, mostly cloudy, with a low around 24. Calm wind.

    Low: 24 °F

    Mostly Cloudy
    then Patchy
    Fog

  • Saturday

    Saturday: Partly sunny, with a high near 42. Calm wind.

    High: 42 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 25. Light and variable wind.

    Low: 25 °F

    Partly Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 41.

    High: 41 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 25.

    Low: 25 °F

    Mostly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 34.

    High: 34 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 18.

    Low: 18 °F

    Mostly Clear

Detailed Forecast

Overnight
Snow, mainly after 3am. Low around 21. East wind around 6 mph. Chance of precipitation is 80%. Total nighttime snow accumulation of less than a half inch possible.
Friday
Snow, mainly before 8am. High near 32. East wind around 5 mph becoming calm in the afternoon. Chance of precipitation is 80%. New snow accumulation of less than a half inch possible.
Friday Night
Patchy fog before 1am, then patchy fog after 2am. Otherwise, mostly cloudy, with a low around 24. Calm wind.
Saturday
Partly sunny, with a high near 42. Calm wind.
Saturday Night
Partly cloudy, with a low around 25. Light and variable wind.
Sunday
Partly sunny, with a high near 41.
Sunday Night
Mostly cloudy, with a low around 25.
Monday
Mostly sunny, with a high near 34.
Monday Night
Mostly clear, with a low around 18.
Tuesday
Mostly sunny, with a high near 39.
Tuesday Night
Mostly cloudy, with a low around 29.
Wednesday
Mostly cloudy, with a high near 47.
Wednesday Night
A chance of rain. Mostly cloudy, with a low around 36. Chance of precipitation is 40%.
Thursday
A chance of rain. Partly sunny, with a high near 44. Chance of precipitation is 30%.
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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:
12:53 am EST Dec 5, 2025
Forecast Valid:
2am EST Dec 5, 2025-6pm EST Dec 11, 2025
 
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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