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

Severe Weather and Heavy Rainfall in the Ohio Valley; Heat Continuing in the South and Southeast

Severe thunderstorms with damaging wind gusts will be possible from the mid-Mississippi Valley into parts of the Ohio Valley and central Appalachians tonight. 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 >

Hazardous Weather Conditions

Current conditions at

St. Louis Lambert International Airport (KSTL)

Lat: 38.75°NLon: 90.37°WElev: 604ft.

Fair

82°F

28°C

Humidity 70%
Wind Speed SW 12 mph
Barometer 29.86 in
Dewpoint 72°F (22°C)
Visibility 10.00 mi
Heat Index86°F (30°C)
Last update 12 Aug 3:51 am CDT
Extended Forecast for

2 Miles W Maryland Heights MO

Extreme Heat Warning August 12, 04:32am until August 13, 08:00pm
Click here for hazard details and duration
Extreme Heat Warning
  •  
    Extreme Heat Warning August 12, 04:32am until August 13, 08:00pm

    NOW until 8:00pm Thu

    Extreme Heat Warning

  • Today

    High: 97 °F

    Hot

  • Tonight

    Tonight: A 30 percent chance of showers and thunderstorms, mainly after 4am. Partly cloudy, with a low around 77. South wind around 5 mph.

    Low: 77 °F

    Chance
    T-storms

  • Thursday

    Thursday: A 20 percent chance of showers and thunderstorms before 8am. Mostly sunny and hot, with a high near 97. Heat index values as high as 106. South wind 5 to 8 mph.

    High: 97 °F

    Slight Chance
    T-storms then
    Mostly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 78. South wind around 6 mph becoming southwest after midnight.

    Low: 78 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny and hot, with a high near 99. Southwest wind 3 to 6 mph.

    High: 99 °F

    Hot

  • Friday Night

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

    Low: 79 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny and hot, with a high near 100.

    High: 100 °F

    Hot

  • Saturday Night

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

    Low: 79 °F

    Mostly Clear

Detailed Forecast

Today
Mostly sunny and hot, with a high near 97. Heat index values as high as 110. Southwest wind 6 to 8 mph.
Tonight
A 30 percent chance of showers and thunderstorms, mainly after 4am. Partly cloudy, with a low around 77. South wind around 5 mph.
Thursday
A 20 percent chance of showers and thunderstorms before 8am. Mostly sunny and hot, with a high near 97. Heat index values as high as 106. South wind 5 to 8 mph.
Thursday Night
Partly cloudy, with a low around 78. South wind around 6 mph becoming southwest after midnight.
Friday
Mostly sunny and hot, with a high near 99. Southwest wind 3 to 6 mph.
Friday Night
Mostly clear, with a low around 79.
Saturday
Sunny and hot, with a high near 100.
Saturday Night
Mostly clear, with a low around 79.
Sunday
Sunny and hot, with a high near 98.
Sunday Night
A 20 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 75.
Monday
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 89.
Monday Night
Partly cloudy, with a low around 70.
Tuesday
Mostly sunny, with a high near 89.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
2 Miles W Maryland Heights MO
 38.72°N 90.51°W (Elev. 446 ft)
Last Update:
1:51 am CDT Aug 12, 2026
Forecast Valid:
4am CDT Aug 12, 2026-6pm CDT Aug 18, 2026
 
Forecast Discussion
 
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Additional Resources

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High Temperature

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Chance of Precipitation