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

Thunderstorms and Heavy Rainfall in the Southeast, Montana, and Iowa; Lowell Begins to Impact Hawaii

Strong thunderstorms with damaging winds and heavy rain are expected across portions of the Southeast. Thunderstorms may produce large hail across portions of Montana. Heavy rainfall could produce flash flooding across Iowa and vulnerable areas in Utah. Lowell will bring heavy rain, dangerous swells and rip currents to portions of Hawaii. Sweltering heat persists across the South-Central US. Read More >

Current conditions at

Washington/Dulles International Airport, DC (KIAD)

Lat: 38.93°NLon: 77.45°WElev: 312ft.

Partly Cloudy

79°F

26°C

Humidity 52%
Wind Speed NE 10 mph
Barometer 29.99 in (1015.4 mb)
Dewpoint 60°F (16°C)
Visibility 10.00 mi
Heat Index80°F (27°C)
Last update 6 Sep 12:52 pm EDT
Extended Forecast for

3 Miles SSE Chantilly VA

  • This Afternoon

    This Afternoon: Mostly sunny, with a high near 83. North wind around 8 mph.

    High: 83 °F

    Mostly Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 62. Light northeast wind.

    Low: 62 °F

    Partly Cloudy

  • Labor Day

    Labor Day: Mostly sunny, with a high near 82. Light north wind.

    High: 82 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 60. Light southeast wind.

    Low: 60 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Sunny, with a high near 85. Calm wind becoming southwest around 5 mph in the afternoon.

    High: 85 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 63.

    Low: 63 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 88.

    High: 88 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 72.

    Low: 72 °F

    Mostly Clear

  • Thursday

    Thursday: A chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 88. Chance of precipitation is 40%.

    High: 88 °F

    Mostly Sunny
    then Chance
    Showers

Detailed Forecast

This Afternoon
Mostly sunny, with a high near 83. North wind around 8 mph.
Tonight
Partly cloudy, with a low around 62. Light northeast wind.
Labor Day
Mostly sunny, with a high near 82. Light north wind.
Monday Night
Partly cloudy, with a low around 60. Light southeast wind.
Tuesday
Sunny, with a high near 85. Calm wind becoming southwest around 5 mph in the afternoon.
Tuesday Night
Partly cloudy, with a low around 63.
Wednesday
Mostly sunny, with a high near 88.
Wednesday Night
Mostly clear, with a low around 72.
Thursday
A chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 88. Chance of precipitation is 40%.
Thursday Night
A chance of showers and thunderstorms, mainly before 8pm. Mostly cloudy, with a low around 65. Chance of precipitation is 30%.
Friday
Mostly sunny, with a high near 81.
Friday Night
Mostly clear, with a low around 62.
Saturday
Sunny, with a high near 83.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles SSE Chantilly VA
 38.84°N 77.38°W (Elev. 449 ft)
Last Update:
10:53 am EDT Sep 6, 2026
Forecast Valid:
1pm EDT Sep 6, 2026-6pm EDT Sep 12, 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