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.

A Few Clouds

72°F

22°C

Humidity 91%
Wind Speed NW 6 mph
Barometer 30.10 in (1019.1 mb)
Dewpoint 69°F (21°C)
Visibility 10.00 mi
Last update 15 Aug 4:52 am EDT
Extended Forecast for

Reston VA

  • Today

    Today: Increasing clouds, with a high near 87. Light and variable wind.

    High: 87 °F

    Increasing
    Clouds

  • Tonight

    Tonight: A chance of showers, with thunderstorms also possible after 5am. Mostly cloudy, with a low around 71. Calm wind becoming southeast around 5 mph after midnight. Chance of precipitation is 30%.

    Low: 71 °F

    Mostly Cloudy
    then Chance
    Showers

  • Sunday

    Sunday: Showers and thunderstorms, mainly before 4pm. High near 84. South wind 7 to 10 mph, with gusts as high as 21 mph. Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible.

    High: 84 °F

    Showers then
    T-storms

  • Sunday Night

    Sunday Night: Showers and thunderstorms likely. Mostly cloudy, with a low around 72. South wind 5 to 7 mph becoming west after midnight. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 72 °F

    T-storms
    Likely then
    Showers
    Likely

  • Monday

    Monday: Mostly sunny, with a high near 88. Northwest wind 7 to 10 mph, with gusts as high as 18 mph.

    High: 88 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 69.

    Low: 69 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 85.

    High: 85 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 67.

    Low: 67 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 88.

    High: 88 °F

    Sunny

Detailed Forecast

Today
Increasing clouds, with a high near 87. Light and variable wind.
Tonight
A chance of showers, with thunderstorms also possible after 5am. Mostly cloudy, with a low around 71. Calm wind becoming southeast around 5 mph after midnight. Chance of precipitation is 30%.
Sunday
Showers and thunderstorms, mainly before 4pm. High near 84. South wind 7 to 10 mph, with gusts as high as 21 mph. Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible.
Sunday Night
Showers and thunderstorms likely. Mostly cloudy, with a low around 72. South wind 5 to 7 mph becoming west after midnight. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Monday
Mostly sunny, with a high near 88. Northwest wind 7 to 10 mph, with gusts as high as 18 mph.
Monday Night
Mostly clear, with a low around 69.
Tuesday
Sunny, with a high near 85.
Tuesday Night
Mostly clear, with a low around 67.
Wednesday
Sunny, with a high near 88.
Wednesday Night
A slight chance of showers. Partly cloudy, with a low around 71. Chance of precipitation is 20%.
Thursday
A chance of showers and thunderstorms. Mostly sunny, with a high near 88. Chance of precipitation is 40%.
Thursday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 67. Chance of precipitation is 40%.
Friday
A slight chance of showers and thunderstorms. Partly sunny, with a high near 83. Chance of precipitation is 20%.
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ABOUT THIS FORECAST

 
Point Forecast:
Reston VA
 38.94°N 77.33°W (Elev. 390 ft)
Last Update:
5:27 am EDT Aug 15, 2026
Forecast Valid:
5am EDT Aug 15, 2026-6pm EDT Aug 21, 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