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

St. Louis Downtown Airport (KCPS)

Lat: 38.56°NLon: 90.15°WElev: 410ft.

Fair

84°F

29°C

Humidity 85%
Wind Speed S 6 mph
Barometer 29.96 in (1014.2 mb)
Dewpoint 79°F (26°C)
Visibility 10.00 mi
Heat Index96°F (36°C)
Last update 10 Aug 8:53 pm CDT
Extended Forecast for

Festus MO

Extreme Heat Warning August 10, 09:26pm until August 12, 08:00pm
Click here for hazard details and duration
Extreme Heat Warning
  •  
    Extreme Heat Warning August 10, 09:26pm until August 12, 08:00pm

    NOW until 8:00pm Wed

    Extreme Heat Warning

  • Tonight

    Low: 77 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Sunny and hot, with a high near 99. Heat index values as high as 110. Southwest wind around 6 mph.

    High: 99 °F

    Hot

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 77. Southwest wind 3 to 5 mph.

    Low: 77 °F

    Partly Cloudy

  • Wednesday

    Wednesday: A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 95. Heat index values as high as 107. Southwest wind around 5 mph.

    High: 95 °F

    Slight Chance
    T-storms

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 76. Light south wind.

    Low: 76 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny and hot, with a high near 97.

    High: 97 °F

    Hot

  • Thursday Night

    Thursday Night: A slight chance of showers and thunderstorms. Partly cloudy, with a low around 74. Chance of precipitation is 20%.

    Low: 74 °F

    Slight Chance
    T-storms

  • Friday

    Friday: Mostly sunny, with a high near 96.

    High: 96 °F

    Mostly Sunny

Detailed Forecast

Tonight
Partly cloudy, with a low around 77. Calm wind becoming south around 6 mph after midnight.
Tuesday
Sunny and hot, with a high near 99. Heat index values as high as 110. Southwest wind around 6 mph.
Tuesday Night
Partly cloudy, with a low around 77. Southwest wind 3 to 5 mph.
Wednesday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 95. Heat index values as high as 107. Southwest wind around 5 mph.
Wednesday Night
Partly cloudy, with a low around 76. Light south wind.
Thursday
Mostly sunny and hot, with a high near 97.
Thursday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 74. Chance of precipitation is 20%.
Friday
Mostly sunny, with a high near 96.
Friday Night
Partly cloudy, with a low around 73.
Saturday
Mostly sunny and hot, with a high near 99.
Saturday Night
Mostly clear, with a low around 75.
Sunday
Mostly sunny and hot, with a high near 98.
Sunday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 72.
Monday
A 20 percent chance of showers and thunderstorms. Partly sunny, with a high near 87.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Festus MO
 38.22°N 90.42°W (Elev. 499 ft)
Last Update:
8:47 pm CDT Aug 10, 2026
Forecast Valid:
9pm CDT Aug 10, 2026-6pm CDT Aug 17, 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