Severe Thunderstorms and Heavy Rain Across the Ohio Valley;

Severe thunderstorms with damaging wind gusts will be possible from the mid-Mississippi Valley into parts of the Ohio Valley and central Appalachians. Heavy rain associated with these storms may lead to considerable flash and urban flooding impacts across portions of the Ohio Valley. Mid-summer heat persists from the Central Plains to the Southeast. Read More >

Current conditions at

St. Louis Lambert International Airport (KSTL)

Lat: 38.75°NLon: 90.37°WElev: 604ft.

Partly Cloudy

81°F

27°C

Humidity 69%
Wind Speed SW 14 mph
Barometer 29.98 in (1013.6 mb)
Dewpoint 70°F (21°C)
Visibility 10.00 mi
Heat Index84°F (29°C)
Last update 11 Aug 6:51 am CDT
Extended Forecast for

Des Peres MO

Extreme Heat Warning August 11, 07:44am until August 12, 08:00pm
Click here for hazard details and duration
Extreme Heat Warning
  •  
    Extreme Heat Warning August 11, 07:44am until August 12, 08:00pm

    NOW until 8:00pm Wed

    Extreme Heat Warning

  • Today

    High: 98 °F

    Hot

  • Tonight

    Tonight: Partly cloudy, with a low around 78. Southwest wind around 6 mph.

    Low: 78 °F

    Partly Cloudy

  • Wednesday

    Wednesday: A 20 percent chance of showers and thunderstorms after 4pm.  Mostly sunny and hot, with a high near 99. Heat index values as high as 110. Southwest wind around 7 mph.

    High: 99 °F

    Sunny then
    Slight Chance
    T-storms

  • Wednesday Night

    Wednesday Night: A 30 percent chance of showers and thunderstorms after 1am.  Partly cloudy, with a low around 77. South wind around 5 mph.

    Low: 77 °F

    Partly Cloudy
    then Chance
    T-storms

  • Thursday

    Thursday: A 20 percent chance of showers and thunderstorms.  Mostly sunny, with a high near 96. South wind around 6 mph becoming east in the afternoon.

    High: 96 °F

    Slight Chance
    T-storms

  • Thursday Night

    Thursday Night: A 30 percent chance of showers and thunderstorms, mainly after 1am.  Mostly cloudy, with a low around 75.

    Low: 75 °F

    Chance
    T-storms

  • Friday

    Friday: Partly sunny, with a high near 94.

    High: 94 °F

    Partly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 76.

    Low: 76 °F

    Partly Cloudy

Detailed Forecast

Today
Mostly sunny and hot, with a high near 98. Heat index values as high as 107. Southwest wind 7 to 9 mph.
Tonight
Partly cloudy, with a low around 78. Southwest wind around 6 mph.
Wednesday
A 20 percent chance of showers and thunderstorms after 4pm. Mostly sunny and hot, with a high near 99. Heat index values as high as 110. Southwest wind around 7 mph.
Wednesday Night
A 30 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 77. South wind around 5 mph.
Thursday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 96. South wind around 6 mph becoming east in the afternoon.
Thursday Night
A 30 percent chance of showers and thunderstorms, mainly after 1am. Mostly cloudy, with a low around 75.
Friday
Partly sunny, with a high near 94.
Friday Night
Partly cloudy, with a low around 76.
Saturday
Mostly sunny and hot, with a high near 99.
Saturday Night
Mostly clear, with a low around 78.
Sunday
Sunny and hot, with a high near 98.
Sunday Night
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 74.
Monday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 88.
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ABOUT THIS FORECAST

 
Point Forecast:
Des Peres MO
 38.6°N 90.46°W (Elev. 574 ft)
6:06 am CDT Aug 11, 2026
7am CDT Aug 11, 2026-6pm CDT Aug 17, 2026
 
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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