Excessive Rainfall and Flooding Threat in the South; Hazardous Heat in the Western U.S. Expanding to the Northern Plains

Multiple rounds of heavy rain and thunderstorms across portions of the Texas and Louisiana Coast will likely lead to flash, urban, small stream and river flooding. An additional heavy rainfall threat will exist from the Lower Mississippi Valley through the southern Mid-Atlantic. Meanwhile, a dangerous heat threat will continue across the Western U.S. and northern Plains through Thursday. Read More >

Hazardous Weather Conditions

Current conditions at

Washington/Dulles International Airport, DC (KIAD)

Lat: 38.93°NLon: 77.45°WElev: 312ft.

Overcast

76°F

24°C

Humidity 91%
Wind Speed Calm
Barometer 30.09 in (1018.5 mb)
Dewpoint 73°F (23°C)
Visibility 7.00 mi
Heat Index76°F (24°C)
Last update 24 Jul 4:52 pm EDT
Extended Forecast for

Herndon VA

  • This Afternoon

    This Afternoon: Scattered showers and thunderstorms.  Cloudy, with a steady temperature around 83. Southwest wind around 7 mph.  Chance of precipitation is 50%.

    High: 83 °F

    Scattered
    T-storms

  • Tonight

    Tonight: Scattered showers and thunderstorms before 8pm, then isolated showers after 4am.  Patchy fog after 1am.  Otherwise, mostly cloudy, with a low around 71. Southwest wind around 6 mph.  Chance of precipitation is 30%.

    Low: 71 °F

    Scattered
    Showers then
    Patchy Fog

  • Thursday

    Thursday: Scattered showers and thunderstorms, then showers likely and possibly a thunderstorm after 5pm.  Cloudy, with a high near 86. West wind 3 to 6 mph.  Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 86 °F

    Cloudy then
    Showers
    Likely

  • Thursday Night

    Thursday Night: Showers and thunderstorms likely before 8pm, then scattered showers between 8pm and 11pm.  Mostly cloudy, with a low around 66. Light and variable wind becoming north around 6 mph in the evening.  Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 66 °F

    Showers
    Likely then
    Mostly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 87. North wind around 7 mph.

    High: 87 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 64.

    Low: 64 °F

    Partly Cloudy

  • Saturday

    Saturday: Sunny, with a high near 89.

    High: 89 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 66.

    Low: 66 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 89.

    High: 89 °F

    Sunny

Detailed Forecast

This Afternoon
Scattered showers and thunderstorms. Cloudy, with a steady temperature around 83. Southwest wind around 7 mph. Chance of precipitation is 50%.
Tonight
Scattered showers and thunderstorms before 8pm, then isolated showers after 4am. Patchy fog after 1am. Otherwise, mostly cloudy, with a low around 71. Southwest wind around 6 mph. Chance of precipitation is 30%.
Thursday
Scattered showers and thunderstorms, then showers likely and possibly a thunderstorm after 5pm. Cloudy, with a high near 86. West wind 3 to 6 mph. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Thursday Night
Showers and thunderstorms likely before 8pm, then scattered showers between 8pm and 11pm. Mostly cloudy, with a low around 66. Light and variable wind becoming north around 6 mph in the evening. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Friday
Mostly sunny, with a high near 87. North wind around 7 mph.
Friday Night
Partly cloudy, with a low around 64.
Saturday
Sunny, with a high near 89.
Saturday Night
Mostly clear, with a low around 66.
Sunday
Sunny, with a high near 89.
Sunday Night
Mostly clear, with a low around 68.
Monday
Mostly sunny, with a high near 89.
Monday Night
Mostly cloudy, with a low around 70.
Tuesday
A chance of showers and thunderstorms. Mostly sunny, with a high near 90. Chance of precipitation is 40%.
Tuesday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 72. Chance of precipitation is 30%.
Wednesday
A chance of showers and thunderstorms. Mostly sunny, with a high near 92.
Click Map For Forecast

ABOUT THIS FORECAST

 
Point Forecast:
Herndon VA
 38.97°N 77.38°W (Elev. 354 ft)
4:29 pm EDT Jul 24, 2024
5pm EDT Jul 24, 2024-6pm EDT Jul 31, 2024
 
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Additional Resources

Radar & Satellite Image

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Hourly Weather Forecast

National Digital Forecast Database