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 Downtown Airport (KCPS)

Lat: 38.56°NLon: 90.15°WElev: 410ft.

Fair

94°F

34°C

Humidity 52%
Wind Speed Vrbl 7 mph
Barometer 29.94 in (1013.4 mb)
Dewpoint 74°F (23°C)
Visibility 10.00 mi
Heat Index104°F (40°C)
Last update 11 Aug 1:53 pm CDT
Extended Forecast for

Barnhart MO

Extreme Heat Warning August 11, 02:15pm until August 12, 08:00pm
Click here for hazard details and duration
Extreme Heat Warning
  •  
    Extreme Heat Warning August 11, 02:15pm until August 12, 08:00pm

    NOW until 8:00pm Wed

    Extreme Heat Warning

  • This Afternoon

    High: 98 °F

    Hot

  • Tonight

    Tonight: Partly cloudy, with a low around 78. Southwest wind 3 to 6 mph.

    Low: 78 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Isolated showers and thunderstorms between 9am and 2pm.  Mostly sunny and hot, with a high near 99. Heat index values as high as 111. Southwest wind around 6 mph.  Chance of precipitation is 20%.

    High: 99 °F

    Isolated
    T-storms

  • Wednesday Night

    Wednesday Night: Isolated showers and thunderstorms before midnight, then isolated showers and thunderstorms after 5am.  Partly cloudy, with a low around 76. Southwest wind 3 to 5 mph.  Chance of precipitation is 20%.

    Low: 76 °F

    Isolated
    T-storms then
    Mostly Clear

  • Thursday

    Thursday: Isolated showers and thunderstorms before 7am, then a slight chance of showers and thunderstorms after 1pm.  Mostly sunny and hot, with a high near 98. Southwest wind around 5 mph becoming northeast in the morning.  Chance of precipitation is 20%.

    High: 98 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 75.

    Low: 75 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 96.

    High: 96 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 75.

    Low: 75 °F

    Partly Cloudy

Detailed Forecast

This Afternoon
Sunny and hot, with a high near 98. Heat index values as high as 110. Southwest wind around 6 mph.
Tonight
Partly cloudy, with a low around 78. Southwest wind 3 to 6 mph.
Wednesday
Isolated showers and thunderstorms between 9am and 2pm. Mostly sunny and hot, with a high near 99. Heat index values as high as 111. Southwest wind around 6 mph. Chance of precipitation is 20%.
Wednesday Night
Isolated showers and thunderstorms before midnight, then isolated showers and thunderstorms after 5am. Partly cloudy, with a low around 76. Southwest wind 3 to 5 mph. Chance of precipitation is 20%.
Thursday
Isolated showers and thunderstorms before 7am, then a slight chance of showers and thunderstorms after 1pm. Mostly sunny and hot, with a high near 98. Southwest wind around 5 mph becoming northeast in the morning. Chance of precipitation is 20%.
Thursday Night
Partly cloudy, with a low around 75.
Friday
Mostly sunny, with a high near 96.
Friday Night
Partly cloudy, with a low around 75.
Saturday
Mostly sunny and hot, with a high near 100.
Saturday Night
Mostly clear, with a low around 76.
Sunday
Sunny and hot, with a high near 99.
Sunday Night
Partly cloudy, with a low around 74.
Monday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 91.
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ABOUT THIS FORECAST

 
Point Forecast:
Barnhart MO
 38.34°N 90.41°W (Elev. 597 ft)
1:26 pm CDT Aug 11, 2026
2pm CDT Aug 11, 2026-6pm CDT Aug 17, 2026
 
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Additional Resources

Radar & Satellite Image

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Hourly Weather Forecast

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