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.

Mostly Cloudy

90°F

32°C

Humidity 59%
Wind Speed SW 8 mph
Barometer 29.95 in (1013.8 mb)
Dewpoint 74°F (23°C)
Visibility 10.00 mi
Heat Index99°F (37°C)
Last update 17 Jul 12:52 pm EDT
Extended Forecast for

Reston VA

Heat Advisory until July 17, 08:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory until July 17, 08:00pm

    NOW until 8:00pm Thu

    Heat Advisory

  • This Afternoon

    High: 95 °F

    Slight Chance
    T-storms

  • Tonight

    Tonight: Partly cloudy, with a low around 73. Southwest wind 6 to 8 mph becoming northwest after midnight.

    Low: 73 °F

    Partly Cloudy

  • Friday

    Friday: A chance of showers and thunderstorms, mainly after 4pm. Partly sunny, with a high near 86. North wind around 6 mph. Chance of precipitation is 30%.

    High: 86 °F

    Mostly Sunny
    then Chance
    T-storms

  • Friday Night

    Friday Night: A chance of showers and thunderstorms, mainly after 8pm. Mostly cloudy, with a low around 71. Light and variable wind. Chance of precipitation is 40%.

    Low: 71 °F

    Chance
    T-storms then
    Chance
    Showers

  • Saturday

    Saturday: A chance of showers before 11am, then a chance of showers and thunderstorms between 11am and 2pm, then showers and possibly a thunderstorm after 2pm. High near 85. Light and variable wind becoming south 5 to 7 mph in the morning. Chance of precipitation is 80%.

    High: 85 °F

    Chance
    Showers then
    Showers

  • Saturday Night

    Saturday Night: Showers and thunderstorms before 11pm, then a chance of showers between 11pm and 2am. Low around 72. Chance of precipitation is 80%.

    Low: 72 °F

    Showers then
    Chance
    Showers

  • Sunday

    Sunday: A chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 89. Chance of precipitation is 50%.

    High: 89 °F

    Mostly Sunny
    then Chance
    T-storms

  • Sunday Night

    Sunday Night: A chance of showers and thunderstorms before 8pm. Mostly cloudy, with a low around 68. Chance of precipitation is 30%.

    Low: 68 °F

    Chance
    T-storms then
    Partly Cloudy

Detailed Forecast

This Afternoon
A slight chance of showers and thunderstorms after 3pm. Mostly sunny, with a high near 95. Heat index values as high as 104. West wind around 11 mph, with gusts as high as 21 mph. Chance of precipitation is 20%.
Tonight
Partly cloudy, with a low around 73. Southwest wind 6 to 8 mph becoming northwest after midnight.
Friday
A chance of showers and thunderstorms, mainly after 4pm. Partly sunny, with a high near 86. North wind around 6 mph. Chance of precipitation is 30%.
Friday Night
A chance of showers and thunderstorms, mainly after 8pm. Mostly cloudy, with a low around 71. Light and variable wind. Chance of precipitation is 40%.
Saturday
A chance of showers before 11am, then a chance of showers and thunderstorms between 11am and 2pm, then showers and possibly a thunderstorm after 2pm. High near 85. Light and variable wind becoming south 5 to 7 mph in the morning. Chance of precipitation is 80%.
Saturday Night
Showers and thunderstorms before 11pm, then a chance of showers between 11pm and 2am. Low around 72. Chance of precipitation is 80%.
Sunday
A chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 89. Chance of precipitation is 50%.
Sunday Night
A chance of showers and thunderstorms before 8pm. Mostly cloudy, with a low around 68. Chance of precipitation is 30%.
Monday
Mostly sunny, with a high near 84.
Monday Night
Partly cloudy, with a low around 65.
Tuesday
A chance of showers. Mostly sunny, with a high near 85. Chance of precipitation is 30%.
Tuesday Night
A chance of showers. Partly cloudy, with a low around 67. Chance of precipitation is 30%.
Wednesday
A chance of showers. Mostly sunny, with a high near 88. Chance of precipitation is 30%.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Reston VA
 38.97°N 77.36°W (Elev. 430 ft)
Last Update:
1:30 pm EDT Jul 17, 2025
Forecast Valid:
1pm EDT Jul 17, 2025-6pm EDT Jul 23, 2025
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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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