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

Severe Weather in the Central Plains; Fire Concerns in the Southern High Plains and Southwest; Late-Season Mountain Snow

Severe storms, including large hail, wind, and perhaps a couple of tornadoes, are possible in the central Plains. Dry, windy conditions and lightning from dry thunderstorms may produce hazardous fire conditions in the Southwest and southern High Plains. Late-season snow is expected in the Northwest and the Great Basin. Heat is spreading across the eastern U.S.. Read More >

Current conditions at

Washington/Dulles International Airport, DC (KIAD)

Lat: 38.93°NLon: 77.45°WElev: 312ft.

Overcast

74°F

23°C

Humidity 60%
Wind Speed W 3 mph
Barometer 29.98 in (1015.1 mb)
Dewpoint 59°F (15°C)
Visibility 10.00 mi
Last update 16 May 8:52 pm EDT
Extended Forecast for

Herndon VA

  • Tonight

    Tonight: Mostly cloudy, with a low around 63. Southwest wind 5 to 7 mph becoming calm after midnight.

    Low: 63 °F

    Mostly Cloudy

  • Sunday

    Sunday: A slight chance of showers and thunderstorms before 4pm, then a slight chance of showers and thunderstorms after 5pm. Mostly sunny, with a high near 88. Calm wind becoming northwest around 5 mph in the afternoon. Chance of precipitation is 20%.

    High: 88 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 65. Calm wind.

    Low: 65 °F

    Partly Cloudy

  • Monday

    Monday: Partly sunny, then gradually becoming sunny, with a high near 94. Calm wind becoming south 5 to 9 mph in the afternoon.

    High: 94 °F

    Becoming
    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 70. South wind around 9 mph.

    Low: 70 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 96.

    High: 96 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 71.

    Low: 71 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Showers likely and possibly a thunderstorm after 2pm. Mostly sunny, with a high near 95. Chance of precipitation is 60%.

    High: 95 °F

    Sunny then
    Showers
    Likely

  • Wednesday Night

    Wednesday Night: Showers likely and possibly a thunderstorm before 2am, then a chance of showers. Mostly cloudy, with a low around 63. Chance of precipitation is 60%.

    Low: 63 °F

    Showers
    Likely

Detailed Forecast

Tonight
Mostly cloudy, with a low around 63. Southwest wind 5 to 7 mph becoming calm after midnight.
Sunday
A slight chance of showers and thunderstorms before 4pm, then a slight chance of showers and thunderstorms after 5pm. Mostly sunny, with a high near 88. Calm wind becoming northwest around 5 mph in the afternoon. Chance of precipitation is 20%.
Sunday Night
Partly cloudy, with a low around 65. Calm wind.
Monday
Partly sunny, then gradually becoming sunny, with a high near 94. Calm wind becoming south 5 to 9 mph in the afternoon.
Monday Night
Mostly clear, with a low around 70. South wind around 9 mph.
Tuesday
Sunny, with a high near 96.
Tuesday Night
Partly cloudy, with a low around 71.
Wednesday
Showers likely and possibly a thunderstorm after 2pm. Mostly sunny, with a high near 95. Chance of precipitation is 60%.
Wednesday Night
Showers likely and possibly a thunderstorm before 2am, then a chance of showers. Mostly cloudy, with a low around 63. Chance of precipitation is 60%.
Thursday
Showers likely, mainly between 8am and 2pm. Partly sunny, with a high near 73. Chance of precipitation is 60%.
Thursday Night
A chance of showers. Mostly cloudy, with a low around 55. Chance of precipitation is 40%.
Friday
A chance of showers. Mostly cloudy, with a high near 68. Chance of precipitation is 50%.
Friday Night
A chance of showers. Mostly cloudy, with a low around 54. Chance of precipitation is 50%.
Saturday
A chance of showers. Mostly cloudy, with a high near 69. Chance of precipitation is 50%.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Herndon VA
 38.99°N 77.38°W (Elev. 318 ft)
Last Update:
7:53 pm EDT May 16, 2026
Forecast Valid:
9pm EDT May 16, 2026-6pm EDT May 23, 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