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.

Mostly Cloudy

70°F

21°C

Humidity 35%
Wind Speed NW 6 mph
Barometer 29.94 in (1013.6 mb)
Dewpoint 41°F (5°C)
Visibility 10.00 mi
Last update 20 May 3:52 pm EDT
Extended Forecast for

Fairfax VA

  • Tonight

    Tonight: Showers likely, mainly after 2am. Cloudy, with a low around 55. Calm wind becoming southeast around 6 mph after midnight. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 55 °F

    Chance
    Showers then
    Showers
    Likely

  • Wednesday

    Wednesday: Showers. High near 60. East wind 11 to 13 mph, with gusts as high as 23 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.

    High: 60 °F

    Showers

  • Wednesday Night

    Wednesday Night: Showers and possibly a thunderstorm before 2am, then a chance of showers. Low around 55. East wind 5 to 9 mph becoming light after midnight. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 55 °F

    Showers

  • Thursday

    Thursday: A chance of showers, then showers likely and possibly a thunderstorm after 2pm. Mostly cloudy, with a high near 70. South wind 5 to 10 mph becoming west in the afternoon. Winds could gust as high as 18 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 70 °F

    Chance
    Showers then
    Showers
    Likely

  • Thursday Night

    Thursday Night: Showers likely, mainly before 8pm. Mostly cloudy, with a low around 52. West wind around 7 mph. Chance of precipitation is 60%.

    Low: 52 °F

    Showers
    Likely then
    Chance
    Showers

  • Friday

    Friday: A slight chance of showers before 8am, then a slight chance of showers after 2pm. Mostly sunny, with a high near 66. Chance of precipitation is 20%.

    High: 66 °F

    Mostly Sunny
    then Slight
    Chance
    Showers

  • Friday Night

    Friday Night: Mostly clear, with a low around 49.

    Low: 49 °F

    Mostly Clear

  • Saturday

    Saturday: Mostly sunny, with a high near 66.

    High: 66 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 50.

    Low: 50 °F

    Mostly Clear

Detailed Forecast

Tonight
Showers likely, mainly after 2am. Cloudy, with a low around 55. Calm wind becoming southeast around 6 mph after midnight. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.
Wednesday
Showers. High near 60. East wind 11 to 13 mph, with gusts as high as 23 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.
Wednesday Night
Showers and possibly a thunderstorm before 2am, then a chance of showers. Low around 55. East wind 5 to 9 mph becoming light after midnight. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Thursday
A chance of showers, then showers likely and possibly a thunderstorm after 2pm. Mostly cloudy, with a high near 70. South wind 5 to 10 mph becoming west in the afternoon. Winds could gust as high as 18 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Thursday Night
Showers likely, mainly before 8pm. Mostly cloudy, with a low around 52. West wind around 7 mph. Chance of precipitation is 60%.
Friday
A slight chance of showers before 8am, then a slight chance of showers after 2pm. Mostly sunny, with a high near 66. Chance of precipitation is 20%.
Friday Night
Mostly clear, with a low around 49.
Saturday
Mostly sunny, with a high near 66.
Saturday Night
Mostly clear, with a low around 50.
Sunday
Mostly sunny, with a high near 71.
Sunday Night
A chance of showers. Mostly cloudy, with a low around 55. Chance of precipitation is 30%.
Memorial Day
A chance of showers. Partly sunny, with a high near 74. Chance of precipitation is 40%.
Monday Night
A chance of showers. Mostly cloudy, with a low around 58. Chance of precipitation is 50%.
Tuesday
A chance of showers. Mostly cloudy, with a high near 71. Chance of precipitation is 50%.
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ABOUT THIS FORECAST

 
Point Forecast:
Fairfax VA
 38.85°N 77.29°W (Elev. 400 ft)
Last Update:
1:30 pm EDT May 20, 2025
Forecast Valid:
4pm EDT May 20, 2025-6pm EDT May 27, 2025
 
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