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.

Fog/Mist

19°C

67°F

Humidity 97%
Wind Speed Calm
Barometer 1016.2 mb (30.01 in)
Dewpoint 19°C (66°F)
Visibility 1.61 km
Last update 17 Jun 5:52 am EDT
Extended Forecast for

Herndon VA

Flood Watch June 17, 11:00am until June 17, 10:00pm
Click here for hazard details and duration
Flood Watch

  • Today

    Today: A chance of rain before 1pm, then a slight chance of showers and thunderstorms after 3pm. Patchy fog before 9am. Otherwise, mostly cloudy, with a high near 28. South wind 5 to 11 km/h. Chance of precipitation is 30%.

    High: 28 °C

    Chance
    Showers and
    Patchy Fog
    then Slight
    Chance
    T-storms

  • Tonight

    Tonight: A chance of showers and thunderstorms before 2am, then a slight chance of showers between 2am and 3am. Mostly cloudy, with a low around 22. Southeast wind 8 to 10 km/h. Chance of precipitation is 40%.

    Low: 22 °C

    Chance
    T-storms

  • Wednesday

    Wednesday: Showers likely and possibly a thunderstorm, mainly after 2pm. Mostly cloudy through mid morning, then becoming sunny, with a high near 33. Southwest wind 10 to 16 km/h. Chance of precipitation is 70%. New rainfall amounts between 1 and 2.5 mm, except higher amounts possible in thunderstorms.

    High: 33 °C

    Chance
    Showers then
    Showers
    Likely

  • Wednesday Night

    Wednesday Night: Showers likely and possibly a thunderstorm before 8pm. Mostly clear, with a low around 23. Southwest wind 8 to 10 km/h. Chance of precipitation is 60%. New precipitation amounts of less than 1 mm, except higher amounts possible in thunderstorms.

    Low: 23 °C

    Showers
    Likely then
    Mostly Clear

  • Juneteenth

    Juneteenth: Showers likely and possibly a thunderstorm after 2pm. Mostly sunny, with a high near 34. Southwest wind 11 to 18 km/h, with gusts as high as 34 km/h. Chance of precipitation is 60%.

    High: 34 °C

    Sunny then
    Showers
    Likely

  • Thursday Night

    Thursday Night: Showers likely and possibly a thunderstorm before 8pm, then a slight chance of showers between 8pm and 2am. Partly cloudy, with a low around 19. Chance of precipitation is 60%.

    Low: 19 °C

    Showers
    Likely then
    Slight Chance
    Showers

  • Friday

    Friday: Sunny, with a high near 31.

    High: 31 °C

    Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 20.

    Low: 20 °C

    Partly Cloudy

  • Saturday

    Saturday: Sunny, with a high near 33.

    High: 33 °C

    Sunny

Detailed Forecast

Today
A chance of rain before 1pm, then a slight chance of showers and thunderstorms after 3pm. Patchy fog before 9am. Otherwise, mostly cloudy, with a high near 28. South wind 5 to 11 km/h. Chance of precipitation is 30%.
Tonight
A chance of showers and thunderstorms before 2am, then a slight chance of showers between 2am and 3am. Mostly cloudy, with a low around 22. Southeast wind 8 to 10 km/h. Chance of precipitation is 40%.
Wednesday
Showers likely and possibly a thunderstorm, mainly after 2pm. Mostly cloudy through mid morning, then becoming sunny, with a high near 33. Southwest wind 10 to 16 km/h. Chance of precipitation is 70%. New rainfall amounts between 1 and 2.5 mm, except higher amounts possible in thunderstorms.
Wednesday Night
Showers likely and possibly a thunderstorm before 8pm. Mostly clear, with a low around 23. Southwest wind 8 to 10 km/h. Chance of precipitation is 60%. New precipitation amounts of less than 1 mm, except higher amounts possible in thunderstorms.
Juneteenth
Showers likely and possibly a thunderstorm after 2pm. Mostly sunny, with a high near 34. Southwest wind 11 to 18 km/h, with gusts as high as 34 km/h. Chance of precipitation is 60%.
Thursday Night
Showers likely and possibly a thunderstorm before 8pm, then a slight chance of showers between 8pm and 2am. Partly cloudy, with a low around 19. Chance of precipitation is 60%.
Friday
Sunny, with a high near 31.
Friday Night
Partly cloudy, with a low around 20.
Saturday
Sunny, with a high near 33.
Saturday Night
Partly cloudy, with a low around 23.
Sunday
Mostly sunny and hot, with a high near 36.
Sunday Night
Mostly clear, with a low around 24.
Monday
Sunny and hot, with a high near 37.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Herndon VA
 38.97°N 77.38°W (Elev. 354 m)
Last Update:
4:29 am EDT Jun 17, 2025
Forecast Valid:
6am EDT Jun 17, 2025-6pm EDT Jun 23, 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