Severe Thunderstorms in the Ohio Valley and Mid-Atlantic; Heat Continuing in the Central U.S.

Widespread strong to severe thunderstorms are expected from the Upper Ohio Valley into the Mid-Atlantic through Friday, with damaging winds as the primary threat. Dangerous heat will continue from the South-Central U.S. to the Midwest, Ohio/Tennessee valleys, and Mid-Atlantic. Widespread Major to Extreme Heat Risk is forecast into the weekend and will confine to the South-Central U.S. by Labor Day Read More >

Current conditions at

St. Louis Regional Airport (KALN)

Lat: 38.89°NLon: 90.03°WElev: 518ft.

Fair

81°F

27°C

Humidity 73%
Wind Speed S 5 mph
Barometer 29.95 in
Dewpoint 71°F (22°C)
Visibility 10.00 mi
Heat Index85°F (29°C)
Last update 4 Sep 1:35 am CDT
Extended Forecast for

Brighton IL

Extreme Heat Warning September 4, 01:52am until September 5, 08:00pm
Click here for hazard details and duration
Extreme Heat Warning
  •  
    Extreme Heat Warning September 4, 01:52am until September 5, 08:00pm

    NOW until 8:00pm Sat

    Extreme Heat Warning

  • Overnight

    Low: 75 °F

    Mostly Clear

  • Friday

    Friday: Sunny and hot, with a high near 99. Heat index values as high as 105. Southwest wind 3 to 7 mph.

    High: 99 °F

    Hot

  • Friday Night

    Friday Night: Partly cloudy, with a low around 74. Light southwest wind.

    Low: 74 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny and hot, with a high near 98. Heat index values as high as 104. Calm wind becoming northwest around 6 mph in the morning.

    High: 98 °F

    Hot

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 71. North wind around 5 mph becoming calm.

    Low: 71 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 92.

    High: 92 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 67.

    Low: 67 °F

    Mostly Clear

  • Labor Day

    Labor Day: Sunny, with a high near 91.

    High: 91 °F

    Sunny

Detailed Forecast

Overnight
Mostly clear, with a low around 75. South wind around 5 mph.
Friday
Sunny and hot, with a high near 99. Heat index values as high as 105. Southwest wind 3 to 7 mph.
Friday Night
Partly cloudy, with a low around 74. Light southwest wind.
Saturday
Mostly sunny and hot, with a high near 98. Heat index values as high as 104. Calm wind becoming northwest around 6 mph in the morning.
Saturday Night
Mostly clear, with a low around 71. North wind around 5 mph becoming calm.
Sunday
Sunny, with a high near 92.
Sunday Night
Mostly clear, with a low around 67.
Labor Day
Sunny, with a high near 91.
Monday Night
Mostly clear, with a low around 67.
Tuesday
Sunny, with a high near 96.
Tuesday Night
Mostly clear, with a low around 74.
Wednesday
Sunny and hot, with a high near 99.
Wednesday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 74.
Thursday
A 20 percent chance of showers and thunderstorms. Sunny, with a high near 94.
Basemap Options
Click map to change the forecast location
Loading map...

ABOUT THIS FORECAST

 
Point Forecast:
Brighton IL
 39.04°N 90.13°W (Elev. 650 ft)
1:26 am CDT Sep 4, 2026
1am CDT Sep 4, 2026-6pm CDT Sep 10, 2026
 
Get as KML Get as XML

Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database