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

Heavy Rainfall and Severe Thunderstorm Threats for the Plains and Southeast

A frontal boundary extending from the western High Plains to the Southeast will focus additional showers and thunderstorms this weekend. Some of these storms may become severe, alongside frequent lightning, and isolated instances of flash flooding. Meanwhile dry conditions will continue for the Great Basin where fire weather concerns linger. For the mid-Atlantic and Northeast, seasonable weather. Read More >

Current conditions at

Washington/Dulles International Airport, DC (KIAD)

Lat: 38.93°NLon: 77.45°WElev: 312ft.

Partly Cloudy

71°F

22°C

Humidity 61%
Wind Speed NE 6 mph
Barometer 30.20 in (1022.3 mb)
Dewpoint 57°F (14°C)
Visibility 10.00 mi
Last update 2 Aug 8:52 pm EDT
Extended Forecast for

Herndon VA

  • Tonight

    Tonight: Mostly clear, with a low around 60. Light northeast wind.

    Low: 60 °F

    Mostly Clear

  • Sunday

    Sunday: Increasing clouds, with a high near 82. Northeast wind 3 to 6 mph.

    High: 82 °F

    Increasing
    Clouds

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 61. Light and variable wind.

    Low: 61 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 86. Calm wind becoming northeast around 6 mph in the afternoon.

    High: 86 °F

    Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 64. Light and variable wind.

    Low: 64 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Partly sunny, with a high near 86.

    High: 86 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 65.

    Low: 65 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 82.

    High: 82 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: A chance of showers after 8pm. Mostly cloudy, with a low around 66. Chance of precipitation is 30%.

    Low: 66 °F

    Chance
    Showers

Detailed Forecast

Tonight
Mostly clear, with a low around 60. Light northeast wind.
Sunday
Increasing clouds, with a high near 82. Northeast wind 3 to 6 mph.
Sunday Night
Mostly clear, with a low around 61. Light and variable wind.
Monday
Sunny, with a high near 86. Calm wind becoming northeast around 6 mph in the afternoon.
Monday Night
Partly cloudy, with a low around 64. Light and variable wind.
Tuesday
Partly sunny, with a high near 86.
Tuesday Night
Mostly cloudy, with a low around 65.
Wednesday
Partly sunny, with a high near 82.
Wednesday Night
A chance of showers after 8pm. Mostly cloudy, with a low around 66. Chance of precipitation is 30%.
Thursday
A chance of showers after 2pm. Partly sunny, with a high near 81. Chance of precipitation is 30%.
Thursday Night
A chance of showers. Mostly cloudy, with a low around 66. Chance of precipitation is 30%.
Friday
Mostly sunny, with a high near 82.
Friday Night
Partly cloudy, with a low around 66.
Saturday
Mostly sunny, with a high near 87.
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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:
7:30 pm EDT Aug 2, 2025
Forecast Valid:
9pm EDT Aug 2, 2025-6pm EDT Aug 9, 2025
 
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