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

Air Quality Concerns; Fire Weather; Extreme Heat; Flash Flooding

Wildfire smoke continues to result in poor air quality from the Upper Midwest into the Northeast. Dangerous heat and fire weather concerns for portions of the Four Corners region into the central Great Basin. Heavy rainfall and flash flooding possible for the Southeast through Monday. For Hawaii, gusty trade winds a drier weather could result in any fires that start to spread rapidly. Read More >

Current conditions at

Washington/Dulles International Airport, DC (KIAD)

Lat: 38.93°NLon: 77.45°WElev: 312ft.

Partly Cloudy

81°F

27°C

Humidity 37%
Wind Speed NW 5 mph
Barometer 30.13 in (1020.1 mb)
Dewpoint 52°F (11°C)
Visibility 10.00 mi
Heat Index80°F (27°C)
Last update 3 Aug 3:52 pm EDT
Extended Forecast for

Herndon VASimilar City Names

  • Tonight

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

    Low: 60 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 86. Calm wind becoming northeast around 5 mph in the afternoon.

    High: 86 °F

    Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 64. Southeast wind around 5 mph becoming calm in the evening.

    Low: 64 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Partly sunny, with a high near 87. Calm wind becoming east around 6 mph in the afternoon.

    High: 87 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 67. Southeast wind around 5 mph becoming calm in the evening.

    Low: 67 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: A chance of showers after 2pm. Partly sunny, with a high near 83. Chance of precipitation is 30%.

    High: 83 °F

    Partly Sunny
    then Chance
    Showers

  • Wednesday Night

    Wednesday Night: A chance of showers. Mostly cloudy, with a low around 67. Chance of precipitation is 30%.

    Low: 67 °F

    Chance
    Showers

  • Thursday

    Thursday: A chance of showers. Partly sunny, with a high near 81. Chance of precipitation is 40%.

    High: 81 °F

    Chance
    Showers

  • Thursday Night

    Thursday Night: A chance of showers before 2am. 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 and variable wind.
Monday
Sunny, with a high near 86. Calm wind becoming northeast around 5 mph in the afternoon.
Monday Night
Partly cloudy, with a low around 64. Southeast wind around 5 mph becoming calm in the evening.
Tuesday
Partly sunny, with a high near 87. Calm wind becoming east around 6 mph in the afternoon.
Tuesday Night
Mostly cloudy, with a low around 67. Southeast wind around 5 mph becoming calm in the evening.
Wednesday
A chance of showers after 2pm. Partly sunny, with a high near 83. Chance of precipitation is 30%.
Wednesday Night
A chance of showers. Mostly cloudy, with a low around 67. Chance of precipitation is 30%.
Thursday
A chance of showers. Partly sunny, with a high near 81. Chance of precipitation is 40%.
Thursday Night
A chance of showers before 2am. 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
Partly sunny, with a high near 83.
Saturday Night
Partly cloudy, with a low around 69.
Sunday
Mostly sunny, with a high near 88.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Herndon VASimilar City Names
 38.97°N 77.38°W (Elev. 354 ft)
Last Update:
1:30 pm EDT Aug 3, 2025
Forecast Valid:
4pm EDT Aug 3, 2025-6pm EDT Aug 10, 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