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

Extreme Heat and Excessive Rainfall Today

Dangerous and extreme heat will remain across portions of the southern U.S. this week. A heat wave over the Southwest U.S. will intensify this week, peaking and expanding into the Intermountain West and northern High Plains this weekend. Multiple rounds of thunderstorms will produce heavy to excessive rainfall with significant flash flooding across portions of southern New England today. Read More >

Current conditions at

Washington/Dulles International Airport, DC (KIAD)

Lat: 38.93°NLon: 77.45°WElev: 312ft.

Partly Cloudy

81°F

27°C

Humidity 49%
Wind Speed NW 14 G 24 mph
Barometer 29.71 in (1005.9 mb)
Dewpoint 60°F (16°C)
Visibility 9.00 mi
Heat Index82°F (28°C)
Last update 29 Jul 11:52 am EDT
Extended Forecast for

Great Falls VA

  • This Afternoon

    This Afternoon: Mostly sunny, with a high near 83. Northwest wind around 14 mph, with gusts as high as 25 mph.

    High: 83 °F

    Mostly Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 66. Northwest wind 8 to 10 mph, with gusts as high as 18 mph.

    Low: 66 °F

    Mostly Clear

  • Thursday

    Thursday: Increasing clouds, with a high near 84. Northwest wind around 11 mph, with gusts as high as 22 mph.

    High: 84 °F

    Increasing
    Clouds

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 66. Northwest wind 3 to 7 mph.

    Low: 66 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 87. Northwest wind 3 to 5 mph.

    High: 87 °F

    Sunny

  • Friday Night

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

    Low: 69 °F

    Partly Cloudy

  • Saturday

    Saturday: Partly sunny, with a high near 88.

    High: 88 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: A slight chance of showers and thunderstorms before 2am. Mostly cloudy, with a low around 71. Chance of precipitation is 20%.

    Low: 71 °F

    Slight Chance
    T-storms

  • Sunday

    Sunday: A slight chance of showers between 8am and 2pm, then a chance of showers and thunderstorms after 2pm. Mostly cloudy, with a high near 87. Chance of precipitation is 40%.

    High: 87 °F

    Chance
    Showers

Detailed Forecast

This Afternoon
Mostly sunny, with a high near 83. Northwest wind around 14 mph, with gusts as high as 25 mph.
Tonight
Mostly clear, with a low around 66. Northwest wind 8 to 10 mph, with gusts as high as 18 mph.
Thursday
Increasing clouds, with a high near 84. Northwest wind around 11 mph, with gusts as high as 22 mph.
Thursday Night
Mostly clear, with a low around 66. Northwest wind 3 to 7 mph.
Friday
Sunny, with a high near 87. Northwest wind 3 to 5 mph.
Friday Night
Partly cloudy, with a low around 69.
Saturday
Partly sunny, with a high near 88.
Saturday Night
A slight chance of showers and thunderstorms before 2am. Mostly cloudy, with a low around 71. Chance of precipitation is 20%.
Sunday
A slight chance of showers between 8am and 2pm, then a chance of showers and thunderstorms after 2pm. Mostly cloudy, with a high near 87. Chance of precipitation is 40%.
Sunday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 71. Chance of precipitation is 40%.
Monday
A chance of showers and thunderstorms. Mostly cloudy, with a high near 86. Chance of precipitation is 50%.
Monday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 70. Chance of precipitation is 30%.
Tuesday
A chance of showers and thunderstorms. Partly sunny, with a high near 87. Chance of precipitation is 40%.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Great Falls VA
 39.01°N 77.29°W (Elev. 348 ft)
Last Update:
10:53 am EDT Jul 29, 2026
Forecast Valid:
12pm EDT Jul 29, 2026-6pm EDT Aug 4, 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