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

Washington/Dulles International Airport, DC (KIAD)

Lat: 38.93°NLon: 77.45°WElev: 312ft.

Overcast

75°F

24°C

Humidity 82%
Wind Speed SW 8 mph
Barometer 29.86 in (1010.7 mb)
Dewpoint 69°F (21°C)
Visibility 10.00 mi
Last update 27 Jul 1:52 am EDT
Extended Forecast for

Fairfax VA

  • Overnight

    Overnight: Mostly clear, with a low around 66. Calm wind.

    Low: 66 °F

    Mostly Clear

  • Monday

    Monday: A chance of showers and thunderstorms, mainly between 2pm and 5pm. Mostly sunny, with a high near 86. Calm wind becoming south around 5 mph in the afternoon. Chance of precipitation is 30%.

    High: 86 °F

    Mostly Sunny
    then Chance
    T-storms

  • Monday Night

    Monday Night: Partly cloudy, with a low around 69. South wind 3 to 5 mph.

    Low: 69 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Showers and possibly a thunderstorm. High near 82. South wind 8 to 10 mph, with gusts as high as 21 mph. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.

    High: 82 °F

    Showers

  • Tuesday Night

    Tuesday Night: A chance of showers and thunderstorms before 11pm, then a chance of showers between 11pm and 2am. Mostly cloudy, with a low around 67. Northwest wind 6 to 9 mph. Chance of precipitation is 50%.

    Low: 67 °F

    Chance
    T-storms then
    Chance
    Showers

  • Wednesday

    Wednesday: A chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 82. Chance of precipitation is 30%.

    High: 82 °F

    Partly Sunny
    then Chance
    Showers

  • Wednesday Night

    Wednesday Night: A chance of showers and thunderstorms before 8pm. Partly cloudy, with a low around 66. Chance of precipitation is 30%.

    Low: 66 °F

    Chance
    Showers then
    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 83.

    High: 83 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 66.

    Low: 66 °F

    Partly Cloudy

Detailed Forecast

Overnight
Mostly clear, with a low around 66. Calm wind.
Monday
A chance of showers and thunderstorms, mainly between 2pm and 5pm. Mostly sunny, with a high near 86. Calm wind becoming south around 5 mph in the afternoon. Chance of precipitation is 30%.
Monday Night
Partly cloudy, with a low around 69. South wind 3 to 5 mph.
Tuesday
Showers and possibly a thunderstorm. High near 82. South wind 8 to 10 mph, with gusts as high as 21 mph. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.
Tuesday Night
A chance of showers and thunderstorms before 11pm, then a chance of showers between 11pm and 2am. Mostly cloudy, with a low around 67. Northwest wind 6 to 9 mph. Chance of precipitation is 50%.
Wednesday
A chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 82. Chance of precipitation is 30%.
Wednesday Night
A chance of showers and thunderstorms before 8pm. Partly cloudy, with a low around 66. Chance of precipitation is 30%.
Thursday
Mostly sunny, with a high near 83.
Thursday Night
Partly cloudy, with a low around 66.
Friday
Sunny, with a high near 86.
Friday Night
Partly cloudy, with a low around 68.
Saturday
A slight chance of showers and thunderstorms. Partly sunny, with a high near 87. Chance of precipitation is 20%.
Saturday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 69. Chance of precipitation is 40%.
Sunday
Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 83. Chance of precipitation is 60%.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Fairfax VA
 38.85°N 77.29°W (Elev. 400 ft)
Last Update:
10:53 pm EDT Jul 26, 2026
Forecast Valid:
2am EDT Jul 27, 2026-6pm EDT Aug 2, 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