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

Areas of Dangerous Heat and Heavy Rain with Possible Flooding into this Weekend

Hot temperatures and high humidity are forecast to continue across the mid-Mississippi Valley into this weekend with heat advisories in effect. Heavy to excessive rainfall occurring at times through Sunday could bring areas of flooding to parts of the upper Midwest, central Great Lakes, southern New England and Virginia/North Carolina tidewater region. Read More >

Current conditions at

Washington/Dulles International Airport, DC (KIAD)

Lat: 38.93°NLon: 77.45°WElev: 312ft.

Mostly Cloudy

72°F

22°C

Humidity 94%
Wind Speed Calm
Barometer 30.10 in (1019.0 mb)
Dewpoint 70°F (21°C)
Visibility 9.00 mi
Last update 18 Sep 6:52 am EDT
Extended Forecast for

Fairfax VA

  • Today

    Today: Partly sunny, with a high near 84. North wind 6 to 8 mph.

    High: 84 °F

    Partly Sunny

  • Tonight

    Tonight: Mostly cloudy, with a low around 63. North wind around 7 mph.

    Low: 63 °F

    Mostly Cloudy

  • Saturday

    Saturday: Partly sunny, with a high near 78. Northeast wind around 6 mph.

    High: 78 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 66. Southeast wind around 6 mph.

    Low: 66 °F

    Mostly Cloudy

  • Sunday

    Sunday: A chance of showers between 2pm and 5pm, then a chance of showers and thunderstorms after 5pm. Mostly cloudy, with a high near 82. South wind 6 to 10 mph, with gusts as high as 18 mph. Chance of precipitation is 50%.

    High: 82 °F

    Mostly Cloudy
    then Chance
    Showers

  • Sunday Night

    Sunday Night: A chance of showers and thunderstorms before 8pm, then showers likely and possibly a thunderstorm between 8pm and 2am, then a slight chance of showers after 2am. Mostly cloudy, with a low around 66. Chance of precipitation is 60%.

    Low: 66 °F

    Showers
    Likely

  • Monday

    Monday: A chance of showers, mainly after 2pm. Mostly cloudy, with a high near 77. Chance of precipitation is 50%.

    High: 77 °F

    Slight Chance
    Showers then
    Chance
    Showers

  • Monday Night

    Monday Night: Showers likely, mainly after 8pm. Mostly cloudy, with a low around 63. Chance of precipitation is 60%.

    Low: 63 °F

    Showers
    Likely

  • Tuesday

    Tuesday: Showers likely. Mostly cloudy, with a high near 69. Chance of precipitation is 60%.

    High: 69 °F

    Showers
    Likely

Detailed Forecast

Today
Partly sunny, with a high near 84. North wind 6 to 8 mph.
Tonight
Mostly cloudy, with a low around 63. North wind around 7 mph.
Saturday
Partly sunny, with a high near 78. Northeast wind around 6 mph.
Saturday Night
Mostly cloudy, with a low around 66. Southeast wind around 6 mph.
Sunday
A chance of showers between 2pm and 5pm, then a chance of showers and thunderstorms after 5pm. Mostly cloudy, with a high near 82. South wind 6 to 10 mph, with gusts as high as 18 mph. Chance of precipitation is 50%.
Sunday Night
A chance of showers and thunderstorms before 8pm, then showers likely and possibly a thunderstorm between 8pm and 2am, then a slight chance of showers after 2am. Mostly cloudy, with a low around 66. Chance of precipitation is 60%.
Monday
A chance of showers, mainly after 2pm. Mostly cloudy, with a high near 77. Chance of precipitation is 50%.
Monday Night
Showers likely, mainly after 8pm. Mostly cloudy, with a low around 63. Chance of precipitation is 60%.
Tuesday
Showers likely. Mostly cloudy, with a high near 69. Chance of precipitation is 60%.
Tuesday Night
Showers likely. Mostly cloudy, with a low around 57. Chance of precipitation is 60%.
Wednesday
A chance of showers. Mostly cloudy, with a high near 63. Chance of precipitation is 50%.
Wednesday Night
A chance of showers. Mostly cloudy, with a low around 56. Chance of precipitation is 50%.
Thursday
A chance of showers. Mostly cloudy, with a high near 68. Chance of precipitation is 40%.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Fairfax VA
 38.85°N 77.29°W (Elev. 400 ft)
Last Update:
5:51 am EDT Sep 18, 2026
Forecast Valid:
7am EDT Sep 18, 2026-6pm EDT Sep 24, 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