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

Heavy Rainfall Across South Texas; Heat in the West

Excessive rainfall may produce locally considerable flash flooding over parts of South Texas, the western Gulf Coast, and Lower Mississippi River Valley through Thursday. Hot temperatures will persist over central and northern California and the Pacific Northwest through today. Read More >

Current conditions at

Washington/Dulles International Airport, DC (KIAD)

Lat: 38.93°NLon: 77.45°WElev: 312ft.

A Few Clouds

69°F

21°C

Humidity 41%
Wind Speed NE 7 mph
Barometer 29.95 in (1013.9 mb)
Dewpoint 44°F (7°C)
Visibility 10.00 mi
Last update 16 Jun 9:52 am EDT
Extended Forecast for

Herndon VA

  • Today

    Today: Sunny, with a high near 80. Calm wind becoming southwest around 5 mph in the afternoon.

    High: 80 °F

    Sunny

  • Tonight

    Tonight: A slight chance of showers between 4am and 5am. Increasing clouds, with a low around 62. Southeast wind 3 to 6 mph. Chance of precipitation is 20%.

    Low: 62 °F

    Partly Cloudy
    then Slight
    Chance
    Showers

  • Wednesday

    Wednesday: Mostly cloudy through mid morning, then becoming sunny, with a high near 87. Southwest wind 5 to 9 mph.

    High: 87 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 68. South wind 3 to 6 mph.

    Low: 68 °F

    Partly Cloudy

  • Thursday

    Thursday: A slight chance of showers, then a chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 94. Southwest wind 14 to 16 mph, with gusts as high as 31 mph. Chance of precipitation is 40%.

    High: 94 °F

    Slight Chance
    Showers then
    Chance
    T-storms

  • Thursday Night

    Thursday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 67. Chance of precipitation is 40%.

    Low: 67 °F

    Chance
    Showers

  • Juneteenth

    Juneteenth: A chance of showers, with thunderstorms also possible after 2pm. Partly sunny, with a high near 82. Chance of precipitation is 50%.

    High: 82 °F

    Chance
    Showers

  • Friday Night

    Friday Night: Partly cloudy, with a low around 62.

    Low: 62 °F

    Partly Cloudy

  • Saturday

    Saturday: Sunny, with a high near 83.

    High: 83 °F

    Sunny

Detailed Forecast

Today
Sunny, with a high near 80. Calm wind becoming southwest around 5 mph in the afternoon.
Tonight
A slight chance of showers between 4am and 5am. Increasing clouds, with a low around 62. Southeast wind 3 to 6 mph. Chance of precipitation is 20%.
Wednesday
Mostly cloudy through mid morning, then becoming sunny, with a high near 87. Southwest wind 5 to 9 mph.
Wednesday Night
Partly cloudy, with a low around 68. South wind 3 to 6 mph.
Thursday
A slight chance of showers, then a chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 94. Southwest wind 14 to 16 mph, with gusts as high as 31 mph. Chance of precipitation is 40%.
Thursday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 67. Chance of precipitation is 40%.
Juneteenth
A chance of showers, with thunderstorms also possible after 2pm. Partly sunny, with a high near 82. Chance of precipitation is 50%.
Friday Night
Partly cloudy, with a low around 62.
Saturday
Sunny, with a high near 83.
Saturday Night
Mostly clear, with a low around 61.
Sunday
Sunny, with a high near 86.
Sunday Night
A slight chance of showers. Partly cloudy, with a low around 65. Chance of precipitation is 20%.
Monday
A chance of showers and thunderstorms. Partly sunny, with a high near 86. Chance of precipitation is 50%.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Herndon VA
 38.97°N 77.38°W (Elev. 354 ft)
Last Update:
9:33 am EDT Jun 16, 2026
Forecast Valid:
10am EDT Jun 16, 2026-6pm EDT Jun 22, 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