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

Heavy Rainfall and Severe Thunderstorms in the Midwest and Ohio Valley Tuesday

Multiple rounds of severe thunderstorms appear likely Tuesday across the Midwest and Ohio Valley, with severe wind gusts in excess of 75 mph as the primary threat. Heavy to excessive rainfall may lead to considerable flash and urban flooding impacts Tuesday across portions of the Ohio Valley. A Moderate Risk (level 3 of 4) of excessive rainfall has been issued. Read More >

Hazardous Weather Conditions

Current conditions at

SULLIVAN (KUUV)

Lat: 38.23°NLon: 91.16°WElev: 933ft.

Fair

N/A

Humidity NA
Wind Speed SW 6 mph
Barometer 30.02 in
Dewpoint N/A
Visibility 10.00 mi
Last update 11 Aug 2:55 am CDT
Extended Forecast for

Saint Clair MO

Extreme Heat Warning August 11, 03:04am until August 12, 08:00pm
Click here for hazard details and duration
Extreme Heat Warning
  •  
    Extreme Heat Warning August 11, 03:04am until August 12, 08:00pm

    NOW until 8:00pm Wed

    Extreme Heat Warning

  • Overnight

    Low: 77 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 96. Heat index values as high as 105. Southwest wind around 7 mph.

    High: 96 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 76. Calm wind becoming southwest around 5 mph after midnight.

    Low: 76 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny and hot, with a high near 97. Heat index values as high as 107. Southwest wind 3 to 5 mph.

    High: 97 °F

    Hot

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 75. Calm wind becoming southwest around 5 mph after midnight.

    Low: 75 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 96.

    High: 96 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: A 20 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 73.

    Low: 73 °F

    Slight Chance
    T-storms

  • Friday

    Friday: Mostly sunny, with a high near 94.

    High: 94 °F

    Mostly Sunny

Detailed Forecast

Overnight
Mostly clear, with a low around 77. Southwest wind around 6 mph.
Tuesday
Mostly sunny, with a high near 96. Heat index values as high as 105. Southwest wind around 7 mph.
Tuesday Night
Mostly clear, with a low around 76. Calm wind becoming southwest around 5 mph after midnight.
Wednesday
Sunny and hot, with a high near 97. Heat index values as high as 107. Southwest wind 3 to 5 mph.
Wednesday Night
Partly cloudy, with a low around 75. Calm wind becoming southwest around 5 mph after midnight.
Thursday
Mostly sunny, with a high near 96.
Thursday Night
A 20 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 73.
Friday
Mostly sunny, with a high near 94.
Friday Night
Partly cloudy, with a low around 74.
Saturday
Mostly sunny and hot, with a high near 98.
Saturday Night
Mostly clear, with a low around 75.
Sunday
Sunny and hot, with a high near 97.
Sunday Night
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 72.
Monday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 87.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Saint Clair MO
 38.35°N 90.98°W (Elev. 715 ft)
Last Update:
2:36 am CDT Aug 11, 2026
Forecast Valid:
3am CDT Aug 11, 2026-6pm CDT Aug 17, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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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