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

Regional Outbreaks of Severe Weather Through Early Next Week; Early Season Heat Wave across the South

Active spring pattern across the center of our nation with several episodes of severe weather and heavy rainfall expected into next week. The potential for very large hail, long track tornadoes, severe wind gusts, frequent cloud to ground lightning strikes and flash flooding are in the outlook. Furthermore, dangerous early season heat wave continues for the Gulf Coast states into early next week. Read More >

Current conditions at

Washington/Dulles International Airport, DC (KIAD)

Lat: 38.93°NLon: 77.45°WElev: 312ft.

Mostly Cloudy

67°F

19°C

Humidity 49%
Wind Speed NW 8 mph
Barometer 29.71 in (1005.7 mb)
Dewpoint 47°F (8°C)
Visibility 10.00 mi
Last update 18 May 2:52 am EDT
Extended Forecast for

Herndon VA

  • Overnight

    Overnight: Partly cloudy, with a low around 61. Northwest wind around 8 mph.

    Low: 61 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 76. West wind 11 to 18 mph, with gusts as high as 34 mph.

    High: 76 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 55. Northwest wind 9 to 14 mph, with gusts as high as 24 mph.

    Low: 55 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 76. Northwest wind around 11 mph, with gusts as high as 22 mph.

    High: 76 °F

    Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 49. North wind 6 to 8 mph.

    Low: 49 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 71.

    High: 71 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Showers. Low around 56. Chance of precipitation is 80%.

    Low: 56 °F

    Showers

  • Wednesday

    Wednesday: Showers. High near 62. Chance of precipitation is 100%.

    High: 62 °F

    Showers

  • Wednesday Night

    Wednesday Night: Showers, mainly before 2am. Low around 53. Chance of precipitation is 90%.

    Low: 53 °F

    Showers

Detailed Forecast

Overnight
Partly cloudy, with a low around 61. Northwest wind around 8 mph.
Sunday
Mostly sunny, with a high near 76. West wind 11 to 18 mph, with gusts as high as 34 mph.
Sunday Night
Mostly clear, with a low around 55. Northwest wind 9 to 14 mph, with gusts as high as 24 mph.
Monday
Sunny, with a high near 76. Northwest wind around 11 mph, with gusts as high as 22 mph.
Monday Night
Partly cloudy, with a low around 49. North wind 6 to 8 mph.
Tuesday
Mostly sunny, with a high near 71.
Tuesday Night
Showers. Low around 56. Chance of precipitation is 80%.
Wednesday
Showers. High near 62. Chance of precipitation is 100%.
Wednesday Night
Showers, mainly before 2am. Low around 53. Chance of precipitation is 90%.
Thursday
Showers likely, mainly after 8am. Mostly cloudy, with a high near 63. Chance of precipitation is 70%.
Thursday Night
A chance of showers. Mostly cloudy, with a low around 51. Chance of precipitation is 40%.
Friday
A chance of showers. Mostly sunny, with a high near 66. Chance of precipitation is 30%.
Friday Night
A chance of showers. Mostly clear, with a low around 50. Chance of precipitation is 30%.
Saturday
Mostly sunny, with a high near 69.
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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:
1:30 am EDT May 18, 2025
Forecast Valid:
3am EDT May 18, 2025-6pm EDT May 24, 2025
 
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