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.

Mostly Cloudy

78°F

26°C

Humidity 79%
Wind Speed NE 5 mph
Barometer 30.07 in (1017.9 mb)
Dewpoint 71°F (22°C)
Visibility 10.00 mi
Heat Index80°F (27°C)
Last update 14 Aug 8:52 pm EDT
Extended Forecast for

Chantilly VA

  • Tonight

    Tonight: A slight chance of showers before 10pm. Patchy fog between 4am and 5am. Otherwise, partly cloudy, with a low around 69. Calm wind. Chance of precipitation is 20%.

    Low: 69 °F

    Slight Chance
    Showers then
    Patchy Fog

  • Saturday

    Saturday: Mostly sunny, with a high near 87. Light and variable wind.

    High: 87 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: A chance of showers, mainly after 5am. Partly cloudy, with a low around 70. Light southeast wind. Chance of precipitation is 30%.

    Low: 70 °F

    Partly Cloudy
    then Chance
    Showers

  • Sunday

    Sunday: Showers likely, with thunderstorms also possible after 11am. Mostly cloudy, with a high near 86. South wind 6 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.

    High: 86 °F

    Showers
    Likely

  • Sunday Night

    Sunday Night: Showers likely and possibly a thunderstorm before 2am. Mostly cloudy, with a low around 72. South wind 6 to 8 mph becoming west after midnight. Chance of precipitation is 60%.

    Low: 72 °F

    Showers
    Likely

  • Monday

    Monday: A slight chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 88. Chance of precipitation is 20%.

    High: 88 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

  • Monday Night

    Monday Night: Partly cloudy, with a low around 69.

    Low: 69 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Sunny, with a high near 86.

    High: 86 °F

    Sunny

  • Tuesday Night

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

    Low: 67 °F

    Mostly Clear

Detailed Forecast

Tonight
A slight chance of showers before 10pm. Patchy fog between 4am and 5am. Otherwise, partly cloudy, with a low around 69. Calm wind. Chance of precipitation is 20%.
Saturday
Mostly sunny, with a high near 87. Light and variable wind.
Saturday Night
A chance of showers, mainly after 5am. Partly cloudy, with a low around 70. Light southeast wind. Chance of precipitation is 30%.
Sunday
Showers likely, with thunderstorms also possible after 11am. Mostly cloudy, with a high near 86. South wind 6 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.
Sunday Night
Showers likely and possibly a thunderstorm before 2am. Mostly cloudy, with a low around 72. South wind 6 to 8 mph becoming west after midnight. Chance of precipitation is 60%.
Monday
A slight chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 88. Chance of precipitation is 20%.
Monday Night
Partly cloudy, with a low around 69.
Tuesday
Sunny, with a high near 86.
Tuesday Night
Mostly clear, with a low around 67.
Wednesday
Sunny, with a high near 89.
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 89. Chance of precipitation is 40%.
Thursday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 68. Chance of precipitation is 30%.
Friday
A slight chance of showers. Mostly sunny, with a high near 83. Chance of precipitation is 20%.
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ABOUT THIS FORECAST

 
Point Forecast:
Chantilly VA
 38.88°N 77.4°W (Elev. 358 ft)
Last Update:
7:53 pm EDT Aug 14, 2026
Forecast Valid:
9pm EDT Aug 14, 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