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

Dangerous Heat and Heavy Rainfall into the Weekend

Hot temperatures and high humidity are forecast to continue across the mid-Mississippi Valley into this weekend. Heat Advisories remain in effect. Heavy to excessive rainfall occurring at times through the weekend could bring areas of flooding to parts of the northern Rockies, upper Midwest, central Great Lakes, and southern New England. Read More >

Current conditions at

Washington/Dulles International Airport, DC (KIAD)

Lat: 38.93°NLon: 77.45°WElev: 312ft.

Overcast

71°F

22°C

Humidity 81%
Wind Speed S 8 mph
Barometer 29.99 in (1015.3 mb)
Dewpoint 65°F (18°C)
Visibility 10.00 mi
Last update 20 Sep 3:52 am EDT
Extended Forecast for

Fairfax VA

  • Today

    Today: Scattered showers, with thunderstorms also possible after 2pm. Mostly cloudy, with a high near 83. South wind 8 to 11 mph becoming southwest in the afternoon. Winds could gust as high as 20 mph. Chance of precipitation is 40%.

    High: 83 °F

    Scattered
    Showers then
    Scattered
    T-storms

  • Tonight

    Tonight: Showers and thunderstorms likely, mainly before midnight. Mostly cloudy, with a low around 63. Calm wind becoming north around 6 mph after midnight. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 63 °F

    Showers
    Likely then
    Slight Chance
    T-storms

  • Monday

    Monday: A slight chance of showers between 2pm and 3pm. Mostly cloudy, with a high near 73. Northeast wind around 8 mph. Chance of precipitation is 20%.

    High: 73 °F

    Partly Sunny
    then Slight
    Chance
    Showers

  • Monday Night

    Monday Night: Showers and thunderstorms likely, then showers after 11pm. Low around 60. East wind 6 to 8 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 60 °F

    Showers

  • Tuesday

    Tuesday: Showers, with thunderstorms also possible after 2pm. High near 65. Northeast wind 10 to 13 mph, with gusts as high as 24 mph. Chance of precipitation is 80%.

    High: 65 °F

    Showers

  • Tuesday Night

    Tuesday Night: Showers likely and possibly a thunderstorm. Cloudy, with a low around 55. Chance of precipitation is 70%.

    Low: 55 °F

    Showers
    Likely

  • Wednesday

    Wednesday: Showers likely. Mostly cloudy, with a high near 63. Chance of precipitation is 60%.

    High: 63 °F

    Showers
    Likely

  • Wednesday Night

    Wednesday Night: A chance of showers. Mostly cloudy, with a low around 54. Chance of precipitation is 50%.

    Low: 54 °F

    Chance
    Showers

  • Thursday

    Thursday: A chance of showers. Mostly cloudy, with a high near 64. Chance of precipitation is 40%.

    High: 64 °F

    Chance
    Showers

Detailed Forecast

Today
Scattered showers, with thunderstorms also possible after 2pm. Mostly cloudy, with a high near 83. South wind 8 to 11 mph becoming southwest in the afternoon. Winds could gust as high as 20 mph. Chance of precipitation is 40%.
Tonight
Showers and thunderstorms likely, mainly before midnight. Mostly cloudy, with a low around 63. Calm wind becoming north around 6 mph after midnight. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Monday
A slight chance of showers between 2pm and 3pm. Mostly cloudy, with a high near 73. Northeast wind around 8 mph. Chance of precipitation is 20%.
Monday Night
Showers and thunderstorms likely, then showers after 11pm. Low around 60. East wind 6 to 8 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Tuesday
Showers, with thunderstorms also possible after 2pm. High near 65. Northeast wind 10 to 13 mph, with gusts as high as 24 mph. Chance of precipitation is 80%.
Tuesday Night
Showers likely and possibly a thunderstorm. Cloudy, with a low around 55. Chance of precipitation is 70%.
Wednesday
Showers likely. Mostly cloudy, with a high near 63. Chance of precipitation is 60%.
Wednesday Night
A chance of showers. Mostly cloudy, with a low around 54. Chance of precipitation is 50%.
Thursday
A chance of showers. Mostly cloudy, with a high near 64. Chance of precipitation is 40%.
Thursday Night
A slight chance of showers before 2am. Mostly cloudy, with a low around 52. Chance of precipitation is 20%.
Friday
A slight chance of showers. Partly sunny, with a high near 65. Chance of precipitation is 20%.
Friday Night
Partly cloudy, with a low around 52.
Saturday
Mostly sunny, with a high near 67.
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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:
2:22 am EDT Sep 20, 2026
Forecast Valid:
4am EDT Sep 20, 2026-6pm EDT Sep 26, 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