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

Dangerous Heat over the South-Central and Southwest U.S. Through Next Week

Dangerous heat persists across the Desert Southwest through this weekend and across the Southern Plains and Lower Mississippi Valley through at least the middle of next week. Numerous daily record high temperatures are expected through at least Tuesday for much of Texas and Oklahoma as well as portions of Louisiana, New Mexico, and Arizona. Read More >

Hazardous Weather Conditions

Current conditions at

Washington/Dulles International Airport, DC (KIAD)

Lat: 38.93°NLon: 77.45°WElev: 312ft.

Light Rain

68°F

20°C

Humidity 93%
Wind Speed S 3 mph
Barometer 29.89 in (1011.7 mb)
Dewpoint 66°F (19°C)
Visibility 10.00 mi
Last update 22 Aug 11:52 pm EDT
Extended Forecast for

Great Falls VA

  • Overnight

    Overnight: Scattered showers and thunderstorms. Mostly cloudy, with a low around 67. Calm wind. Chance of precipitation is 50%.

    Low: 67 °F

    Scattered
    Showers

  • Sunday

    Sunday: Mostly sunny, with a high near 84. West wind 6 to 10 mph, with gusts as high as 20 mph.

    High: 84 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 62. West wind around 6 mph becoming calm in the evening.

    Low: 62 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 83. West wind 3 to 8 mph.

    High: 83 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 61. Northwest wind around 6 mph becoming calm in the evening.

    Low: 61 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 84.

    High: 84 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 64.

    Low: 64 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 86.

    High: 86 °F

    Sunny

  • Wednesday Night

    Wednesday Night: A chance of showers, mainly before 2am. Mostly cloudy, with a low around 69. Chance of precipitation is 30%.

    Low: 69 °F

    Chance
    Showers

Detailed Forecast

Overnight
Scattered showers and thunderstorms. Mostly cloudy, with a low around 67. Calm wind. Chance of precipitation is 50%.
Sunday
Mostly sunny, with a high near 84. West wind 6 to 10 mph, with gusts as high as 20 mph.
Sunday Night
Mostly clear, with a low around 62. West wind around 6 mph becoming calm in the evening.
Monday
Sunny, with a high near 83. West wind 3 to 8 mph.
Monday Night
Mostly clear, with a low around 61. Northwest wind around 6 mph becoming calm in the evening.
Tuesday
Sunny, with a high near 84.
Tuesday Night
Mostly clear, with a low around 64.
Wednesday
Sunny, with a high near 86.
Wednesday Night
A chance of showers, mainly before 2am. Mostly cloudy, with a low around 69. Chance of precipitation is 30%.
Thursday
A slight chance of showers, then a chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 86. Chance of precipitation is 50%.
Thursday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 69. Chance of precipitation is 50%.
Friday
A chance of showers and thunderstorms. Mostly sunny, with a high near 86. Chance of precipitation is 30%.
Friday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 69. Chance of precipitation is 30%.
Saturday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 86. Chance of precipitation is 20%.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Great Falls VA
 39°N 77.26°W (Elev. 259 ft)
Last Update:
10:53 pm EDT Aug 22, 2026
Forecast Valid:
12am EDT Aug 23, 2026-6pm EDT Aug 29, 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