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

Heavy Rainfall and Flooding Threats in the Midwest and Ohio Valley; Heat Continues in the Plains and Southeast

An active pattern will continue to bring heavy to excessive rainfall and flash flooding threats to the Midwest and Ohio Valley over the next couple of days. Dangerous heat continues across the central/southern Plains and Southeast U.S. into next week. There is potential for record-tying/breaking temperatures with many areas forecast to see their hottest temperatures so far this year. Read More >

Hazardous Weather Conditions

Current conditions at

St. Louis Lambert International Airport (KSTL)

Lat: 38.75°NLon: 90.37°WElev: 604ft.

Mostly Cloudy

80°F

27°C

Humidity 69%
Wind Speed Calm
Barometer 29.86 in (1009.8 mb)
Dewpoint 69°F (21°C)
Visibility 10.00 mi
Heat Index83°F (28°C)
Last update 12 Aug 10:51 pm CDT
Extended Forecast for

Overland MO

Extreme Heat Warning August 12, 11:11pm until August 15, 09:00pm
Click here for hazard details and duration
Extreme Heat Warning
  •  
    Extreme Heat Warning August 12, 11:11pm until August 15, 09:00pm

    NOW until 9:00pm Sat

    Extreme Heat Warning

  • Tonight

    Low: 76 °F

    Scattered
    T-storms

  • Thursday

    Thursday: Scattered showers and thunderstorms before 11am, then isolated showers and thunderstorms after 3pm. Partly sunny and hot, with a high near 98. Heat index values as high as 109. Southeast wind 5 to 7 mph becoming west in the afternoon. Chance of precipitation is 30%.

    High: 98 °F

    Scattered
    T-storms

  • Thursday Night

    Thursday Night: Isolated showers and thunderstorms before 10pm. Partly cloudy, with a low around 79. Southeast wind around 7 mph. Chance of precipitation is 20%.

    Low: 79 °F

    Isolated
    T-storms then
    Partly Cloudy

  • Friday

    Friday: Mostly sunny and hot, with a high near 99. Heat index values as high as 109. Southwest wind around 6 mph.

    High: 99 °F

    Hot

  • Friday Night

    Friday Night: Mostly clear, with a low around 79. South wind around 6 mph.

    Low: 79 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny and hot, with a high near 99.

    High: 99 °F

    Hot

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 79.

    Low: 79 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny and hot, with a high near 99.

    High: 99 °F

    Hot

Detailed Forecast

Tonight
Scattered showers and thunderstorms, mainly after 5am. Mostly cloudy, with a low around 76. South wind around 6 mph. Chance of precipitation is 30%.
Thursday
Scattered showers and thunderstorms before 11am, then isolated showers and thunderstorms after 3pm. Partly sunny and hot, with a high near 98. Heat index values as high as 109. Southeast wind 5 to 7 mph becoming west in the afternoon. Chance of precipitation is 30%.
Thursday Night
Isolated showers and thunderstorms before 10pm. Partly cloudy, with a low around 79. Southeast wind around 7 mph. Chance of precipitation is 20%.
Friday
Mostly sunny and hot, with a high near 99. Heat index values as high as 109. Southwest wind around 6 mph.
Friday Night
Mostly clear, with a low around 79. South wind around 6 mph.
Saturday
Sunny and hot, with a high near 99.
Saturday Night
Mostly clear, with a low around 79.
Sunday
Sunny and hot, with a high near 99.
Sunday Night
A 30 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 75.
Monday
A 20 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 89.
Monday Night
A 20 percent chance of showers. Partly cloudy, with a low around 71.
Tuesday
A 20 percent chance of showers. Mostly sunny, with a high near 89.
Tuesday Night
Partly cloudy, with a low around 73.
Wednesday
Mostly sunny, with a high near 93.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Overland MO
 38.71°N 90.37°W (Elev. 600 ft)
Last Update:
9:46 pm CDT Aug 12, 2026
Forecast Valid:
11pm CDT Aug 12, 2026-6pm CDT Aug 19, 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