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

Excessive Rainfall Possible This Weekend; October Heat Wave in California

A slow moving front will be the focus area for heavy to excessive rainfall and a threat for flash/urban flooding across the northern Gulf Coast and Southeast U.S. through this weekend. Abnormally hot, potentially record-breaking, temperatures will impact southern California and stretch north toward the Bay Area and Central Valley into next week. Read More >

Current conditions at

Washington/Dulles International Airport, DC (KIAD)

Lat: 38.93°NLon: 77.45°WElev: 312ft.

Light Rain Fog/Mist

62°F

17°C

Humidity 96%
Wind Speed NE 6 mph
Barometer 30.14 in (1020.6 mb)
Dewpoint 61°F (16°C)
Visibility 2.00 mi
Last update 4 Oct 1:52 pm EDT
Extended Forecast for

2 Miles SW Herndon VA

  • This Afternoon

    This Afternoon: Patchy fog. Otherwise, cloudy, with a high near 64. Light northeast wind.

    High: 64 °F

    Patchy Fog

  • Tonight

    Tonight: Patchy fog. Otherwise, mostly cloudy, with a low around 56. Calm wind.

    Low: 56 °F

    Patchy Fog

  • Monday

    Monday: Mostly cloudy through mid morning, then gradual clearing, with a high near 70. Northwest wind 5 to 13 mph, with gusts as high as 22 mph.

    High: 70 °F

    Becoming
    Sunny

  • Monday Night

    Monday Night: Clear, with a low around 45. Northwest wind 5 to 7 mph.

    Low: 45 °F

    Clear

  • Tuesday

    Tuesday: Sunny, with a high near 65. Light northwest wind.

    High: 65 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Clear, with a low around 44.

    Low: 44 °F

    Clear

  • Wednesday

    Wednesday: Sunny, with a high near 71.

    High: 71 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Clear, with a low around 52.

    Low: 52 °F

    Clear

  • Thursday

    Thursday: Sunny, with a high near 77.

    High: 77 °F

    Sunny

Detailed Forecast

This Afternoon
Patchy fog. Otherwise, cloudy, with a high near 64. Light northeast wind.
Tonight
Patchy fog. Otherwise, mostly cloudy, with a low around 56. Calm wind.
Monday
Mostly cloudy through mid morning, then gradual clearing, with a high near 70. Northwest wind 5 to 13 mph, with gusts as high as 22 mph.
Monday Night
Clear, with a low around 45. Northwest wind 5 to 7 mph.
Tuesday
Sunny, with a high near 65. Light northwest wind.
Tuesday Night
Clear, with a low around 44.
Wednesday
Sunny, with a high near 71.
Wednesday Night
Clear, with a low around 52.
Thursday
Sunny, with a high near 77.
Thursday Night
Mostly clear, with a low around 52.
Friday
Sunny, with a high near 74.
Friday Night
Mostly clear, with a low around 51.
Saturday
Mostly sunny, with a high near 71.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
2 Miles SW Herndon VA
 38.95°N 77.42°W (Elev. 351 ft)
Last Update:
2:23 pm EDT Oct 4, 2026
Forecast Valid:
2pm EDT Oct 4, 2026-6pm EDT Oct 10, 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