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.

Fair

74°F

23°C

Humidity 94%
Wind Speed Calm
Barometer 29.87 in (1011.1 mb)
Dewpoint 72°F (22°C)
Visibility 10.00 mi
Last update 17 Aug 11:52 pm EDT
Extended Forecast for

Reston VA

  • Overnight

    Overnight: Mostly cloudy, then gradually becoming mostly clear, with a low around 71. Light northwest wind.

    Low: 71 °F

    Decreasing
    Clouds

  • Tuesday

    Tuesday: Sunny, with a high near 85. Northwest wind 6 to 8 mph.

    High: 85 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 66. Light northwest wind.

    Low: 66 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 87. Calm wind becoming west around 6 mph in the afternoon.

    High: 87 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 70. Calm wind.

    Low: 70 °F

    Partly Cloudy

  • Thursday

    Thursday: A slight chance of showers, then showers likely and possibly a thunderstorm after 2pm. Partly sunny, with a high near 84. Chance of precipitation is 70%.

    High: 84 °F

    Slight Chance
    Showers then
    Showers
    Likely

  • Thursday Night

    Thursday Night: Showers likely and possibly a thunderstorm before 8pm, then a chance of showers and thunderstorms after 8pm. Mostly cloudy, with a low around 67. Chance of precipitation is 60%.

    Low: 67 °F

    Showers
    Likely

  • Friday

    Friday: A slight chance of showers, then a chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 80. Chance of precipitation is 50%.

    High: 80 °F

    Slight Chance
    Showers then
    Chance
    T-storms

  • Friday Night

    Friday Night: A chance of showers and thunderstorms before 8pm, then showers likely and possibly a thunderstorm between 8pm and 2am, then a chance of showers after 2am. Mostly cloudy, with a low around 67. Chance of precipitation is 60%.

    Low: 67 °F

    Showers
    Likely

Detailed Forecast

Overnight
Mostly cloudy, then gradually becoming mostly clear, with a low around 71. Light northwest wind.
Tuesday
Sunny, with a high near 85. Northwest wind 6 to 8 mph.
Tuesday Night
Mostly clear, with a low around 66. Light northwest wind.
Wednesday
Sunny, with a high near 87. Calm wind becoming west around 6 mph in the afternoon.
Wednesday Night
Partly cloudy, with a low around 70. Calm wind.
Thursday
A slight chance of showers, then showers likely and possibly a thunderstorm after 2pm. Partly sunny, with a high near 84. Chance of precipitation is 70%.
Thursday Night
Showers likely and possibly a thunderstorm before 8pm, then a chance of showers and thunderstorms after 8pm. Mostly cloudy, with a low around 67. Chance of precipitation is 60%.
Friday
A slight chance of showers, then a chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 80. Chance of precipitation is 50%.
Friday Night
A chance of showers and thunderstorms before 8pm, then showers likely and possibly a thunderstorm between 8pm and 2am, then a chance of showers after 2am. Mostly cloudy, with a low around 67. Chance of precipitation is 60%.
Saturday
A chance of showers, mainly after 2pm. Partly sunny, with a high near 80. Chance of precipitation is 50%.
Saturday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 67. Chance of precipitation is 40%.
Sunday
A chance of showers and thunderstorms. Partly sunny, with a high near 81. Chance of precipitation is 40%.
Sunday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 64. Chance of precipitation is 30%.
Monday
Sunny, with a high near 80.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Reston VA
 38.95°N 77.36°W (Elev. 446 ft)
Last Update:
10:53 pm EDT Aug 17, 2026
Forecast Valid:
12am EDT Aug 18, 2026-6pm EDT Aug 24, 2026
 
Forecast Discussion
 
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Additional Resources

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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