Severe Thunderstorms and Heavy Rain Across the Ohio Valley;

Severe thunderstorms with damaging wind gusts will be possible from the mid-Mississippi Valley into parts of the Ohio Valley and central Appalachians. Heavy rain associated with these storms may lead to considerable flash and urban flooding impacts across portions of the Ohio Valley. Mid-summer heat persists from the Central Plains to the Southeast. Read More >

Hazardous Weather Conditions

Current conditions at

Washington/Dulles International Airport, DC (KIAD)

Lat: 38.93°NLon: 77.45°WElev: 312ft.

Mostly Cloudy

70°F

21°C

Humidity 90%
Wind Speed NW 5 mph
Barometer 29.92 in (1012.7 mb)
Dewpoint 67°F (19°C)
Visibility 7.00 mi
Last update 11 Aug 7:52 am EDT
Extended Forecast for

Herndon VA

  • Today

    Today: A chance of showers before 9am, then a slight chance of showers and thunderstorms after 2pm.  Partly sunny, with a high near 89. West wind 3 to 8 mph.  Chance of precipitation is 30%.

    High: 89 °F

    Chance
    Showers then
    Slight Chance
    T-storms

  • Tonight

    Tonight: A chance of showers and thunderstorms before 1am, then a chance of showers after 4am.  Mostly cloudy, with a low around 69. Northwest wind 3 to 5 mph.  Chance of precipitation is 30%.

    Low: 69 °F

    Chance
    T-storms then
    Chance
    Showers

  • Wednesday

    Wednesday: A chance of showers, with thunderstorms also possible after 5pm.  Partly sunny, with a high near 86. Northwest wind 5 to 7 mph.  Chance of precipitation is 30%.

    High: 86 °F

    Chance
    Showers

  • Wednesday Night

    Wednesday Night: A chance of showers and thunderstorms.  Mostly cloudy, with a low around 70. Light and variable wind.  Chance of precipitation is 30%.

    Low: 70 °F

    Chance
    Showers

  • Thursday

    Thursday: A slight chance of showers, with thunderstorms also possible after 5pm.  Mostly sunny, with a high near 88. West wind 3 to 6 mph.  Chance of precipitation is 20%.

    High: 88 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

  • Thursday Night

    Thursday Night: A chance of showers and thunderstorms before 11pm, then a chance of showers between 11pm and 2am, then a chance of showers and thunderstorms after 2am.  Mostly cloudy, with a low around 71. Chance of precipitation is 30%.

    Low: 71 °F

    Chance
    Showers

  • Friday

    Friday: A chance of showers and thunderstorms, mainly before 2pm.  Mostly sunny, with a high near 85. Chance of precipitation is 30%.

    High: 85 °F

    Chance
    Showers

  • Friday Night

    Friday Night: Partly cloudy, with a low around 64.

    Low: 64 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 81.

    High: 81 °F

    Mostly Sunny

Detailed Forecast

Today
A chance of showers before 9am, then a slight chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 89. West wind 3 to 8 mph. Chance of precipitation is 30%.
Tonight
A chance of showers and thunderstorms before 1am, then a chance of showers after 4am. Mostly cloudy, with a low around 69. Northwest wind 3 to 5 mph. Chance of precipitation is 30%.
Wednesday
A chance of showers, with thunderstorms also possible after 5pm. Partly sunny, with a high near 86. Northwest wind 5 to 7 mph. Chance of precipitation is 30%.
Wednesday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 70. Light and variable wind. Chance of precipitation is 30%.
Thursday
A slight chance of showers, with thunderstorms also possible after 5pm. Mostly sunny, with a high near 88. West wind 3 to 6 mph. Chance of precipitation is 20%.
Thursday Night
A chance of showers and thunderstorms before 11pm, then a chance of showers between 11pm and 2am, then a chance of showers and thunderstorms after 2am. Mostly cloudy, with a low around 71. Chance of precipitation is 30%.
Friday
A chance of showers and thunderstorms, mainly before 2pm. Mostly sunny, with a high near 85. Chance of precipitation is 30%.
Friday Night
Partly cloudy, with a low around 64.
Saturday
Mostly sunny, with a high near 81.
Saturday Night
Partly cloudy, with a low around 64.
Sunday
A chance of showers and thunderstorms. Mostly sunny, with a high near 86. Chance of precipitation is 30%.
Sunday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 69. Chance of precipitation is 50%.
Monday
A chance of showers and thunderstorms. Mostly sunny, with a high near 86. Chance of precipitation is 40%.
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ABOUT THIS FORECAST

 
Point Forecast:
Herndon VA
 38.97°N 77.41°W (Elev. 348 ft)
4:53 am EDT Aug 11, 2026
7am EDT Aug 11, 2026-6pm EDT Aug 17, 2026
 
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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