Severe Weather and Heavy Rainfall in the Midwest and Desert Southwest; Mid-Summer Heat Continues

Severe thunderstorm and heavy rainfall are possible in the Midwest into the Central Appalachians and the Desert Southwest early this week. Storms are also expected in parts of the northern Plains today. Fire weather and air quality concerns will persist across portions of the West. Mid-summer heat will continue across much of the CONUS this week, especially in the the south-central High Plains. Read More >

Current conditions at

St. Louis Lambert International Airport (KSTL)

Lat: 38.75°NLon: 90.37°WElev: 604ft.

Overcast

84°F

29°C

Humidity 65%
Wind Speed SW 6 mph
Barometer 30.01 in (1014.9 mb)
Dewpoint 71°F (22°C)
Visibility 10.00 mi
Heat Index89°F (32°C)
Last update 10 Aug 10:51 am CDT
Extended Forecast for

Clayton MO

Extreme Heat Warning August 10, 11:18am until August 12, 08:00pm
Click here for hazard details and duration
Extreme Heat Warning
  •  
    Extreme Heat Warning August 10, 11:18am until August 12, 08:00pm

    NOW until 8:00pm Wed

    Extreme Heat Warning

  • Today

    High: 96 °F

    Partly Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 79. South wind around 7 mph.

    Low: 79 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Sunny and hot, with a high near 99. Heat index values as high as 110. Southwest wind 6 to 8 mph.

    High: 99 °F

    Hot

  • Tuesday Night

    Tuesday Night: A 20 percent chance of showers after 1am.  Partly cloudy, with a low around 79. Southwest wind around 6 mph.

    Low: 79 °F

    Mostly Clear
    then Slight
    Chance
    Showers

  • Wednesday

    Wednesday: A 20 percent chance of showers before 1pm.  Mostly sunny and hot, with a high near 97. West wind 6 to 8 mph.

    High: 97 °F

    Slight Chance
    Showers

  • Wednesday Night

    Wednesday Night: A chance of showers and thunderstorms before 10pm, then a chance of showers between 10pm and 1am, then a chance of showers and thunderstorms after 1am.  Partly cloudy, with a low around 77. Chance of precipitation is 40%.

    Low: 77 °F

    Chance
    Showers then
    Chance
    T-storms

  • Thursday

    Thursday: A 20 percent chance of showers and thunderstorms.  Partly sunny, with a high near 92.

    High: 92 °F

    Slight Chance
    T-storms

  • Thursday Night

    Thursday Night: A 50 percent chance of showers and thunderstorms.  Mostly cloudy, with a low around 75.

    Low: 75 °F

    Chance
    T-storms

Detailed Forecast

Today
Partly sunny, with a high near 96. Heat index values as high as 104. Southwest wind 6 to 8 mph.
Tonight
Partly cloudy, with a low around 79. South wind around 7 mph.
Tuesday
Sunny and hot, with a high near 99. Heat index values as high as 110. Southwest wind 6 to 8 mph.
Tuesday Night
A 20 percent chance of showers after 1am. Partly cloudy, with a low around 79. Southwest wind around 6 mph.
Wednesday
A 20 percent chance of showers before 1pm. Mostly sunny and hot, with a high near 97. West wind 6 to 8 mph.
Wednesday Night
A chance of showers and thunderstorms before 10pm, then a chance of showers between 10pm and 1am, then a chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 77. Chance of precipitation is 40%.
Thursday
A 20 percent chance of showers and thunderstorms. Partly sunny, with a high near 92.
Thursday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 75.
Friday
A slight chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 89. Chance of precipitation is 20%.
Friday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 74.
Saturday
A 20 percent chance of showers. Mostly sunny, with a high near 92.
Saturday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 75.
Sunday
A 20 percent chance of showers. Mostly sunny, with a high near 91.
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ABOUT THIS FORECAST

 
Point Forecast:
Clayton MO
 38.64°N 90.32°W (Elev. 558 ft)
10:46 am CDT Aug 10, 2026
11am CDT Aug 10, 2026-6pm CDT Aug 16, 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