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.

Rain

21°C

70°F

Humidity 93%
Wind Speed S 7 km/h
Barometer 1007.0 mb (29.75 in)
Dewpoint 20°C (68°F)
Visibility 4.02 km
Last update 21 Jul 9:52 pm EDT
Extended Forecast for

Fairfax VA

  • Tonight

    Tonight: Showers and thunderstorms before 2am, then scattered showers. Patchy fog between 2am and 3am. Low around 22. Southwest wind around 14 km/h, with gusts as high as 32 km/h. Chance of precipitation is 100%. New rainfall amounts between 1 and 2.5 mm, except higher amounts possible in thunderstorms.

    Low: 22 °C

    Showers and
    Patchy Fog
    then Showers
    Likely and
    Patchy Fog

  • Wednesday

    Wednesday: A slight chance of showers between 11am and 2pm, then a chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 29. West wind 11 to 16 km/h. Chance of precipitation is 50%.

    High: 29 °C

    Slight Chance
    Showers then
    Chance
    T-storms

  • Wednesday Night

    Wednesday Night: A chance of showers and thunderstorms before 8pm, then a slight chance of showers between 8pm and 9pm. Mostly cloudy, with a low around 17. North wind 11 to 14 km/h. Chance of precipitation is 30%.

    Low: 17 °C

    Chance
    T-storms then
    Mostly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 26. North wind 13 to 18 km/h.

    High: 26 °C

    Mostly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 17. East wind 5 to 10 km/h becoming calm.

    Low: 17 °C

    Partly Cloudy

  • Friday

    Friday: Sunny, with a high near 27.

    High: 27 °C

    Sunny

  • Friday Night

    Friday Night: A slight chance of showers after 2am. Mostly cloudy, with a low around 18. Chance of precipitation is 20%.

    Low: 18 °C

    Mostly Cloudy
    then Slight
    Chance
    Showers

  • Saturday

    Saturday: A slight chance of showers. Partly sunny, with a high near 27. Chance of precipitation is 20%.

    High: 27 °C

    Slight Chance
    Showers

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 18.

    Low: 18 °C

    Partly Cloudy

Detailed Forecast

Tonight
Showers and thunderstorms before 2am, then scattered showers. Patchy fog between 2am and 3am. Low around 22. Southwest wind around 14 km/h, with gusts as high as 32 km/h. Chance of precipitation is 100%. New rainfall amounts between 1 and 2.5 mm, except higher amounts possible in thunderstorms.
Wednesday
A slight chance of showers between 11am and 2pm, then a chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 29. West wind 11 to 16 km/h. Chance of precipitation is 50%.
Wednesday Night
A chance of showers and thunderstorms before 8pm, then a slight chance of showers between 8pm and 9pm. Mostly cloudy, with a low around 17. North wind 11 to 14 km/h. Chance of precipitation is 30%.
Thursday
Mostly sunny, with a high near 26. North wind 13 to 18 km/h.
Thursday Night
Partly cloudy, with a low around 17. East wind 5 to 10 km/h becoming calm.
Friday
Sunny, with a high near 27.
Friday Night
A slight chance of showers after 2am. Mostly cloudy, with a low around 18. Chance of precipitation is 20%.
Saturday
A slight chance of showers. Partly sunny, with a high near 27. Chance of precipitation is 20%.
Saturday Night
Partly cloudy, with a low around 18.
Sunday
A slight chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 29. Chance of precipitation is 20%.
Sunday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 21. Chance of precipitation is 30%.
Monday
A chance of showers and thunderstorms. Mostly sunny, with a high near 31. Chance of precipitation is 40%.
Monday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 22. Chance of precipitation is 40%.
Tuesday
A chance of showers and thunderstorms. Partly sunny, with a high near 30. Chance of precipitation is 30%.
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ABOUT THIS FORECAST

 
Point Forecast:
Fairfax VA
 38.85°N 77.29°W (Elev. 400 m)
Last Update:
9:43 pm EDT Jul 21, 2026
Forecast Valid:
10pm EDT Jul 21, 2026-6pm EDT Jul 28, 2026
 
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