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

Hazardous Weather Conditions

Current conditions at

St. Louis Lambert International Airport (KSTL)

Lat: 38.75°NLon: 90.37°WElev: 604ft.

A Few Clouds

82°F

28°C

Humidity 85%
Wind Speed S 7 mph
Barometer 29.96 in (1013.0 mb)
Dewpoint 77°F (25°C)
Visibility 10.00 mi
Heat Index90°F (32°C)
Last update 19 Jul 11:51 pm CDT
Extended Forecast for

Saint Louis MO

Extreme Heat Warning July 20, 12:16am until July 24, 07:00pm
Click here for hazard details and duration
Extreme Heat Warning
  •  
    Extreme Heat Warning July 20, 12:16am until July 24, 07:00pm

    NOW until 7:00pm Thu

    Extreme Heat Warning

  • Overnight

    Low: 78 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny and hot, with a high near 97. Heat index values as high as 107. Southwest wind 5 to 7 mph.

    High: 97 °F

    Hot

  • Sunday Night

    Sunday Night: A 40 percent chance of showers and thunderstorms, mainly after 7pm. Partly cloudy, with a low around 77. West wind around 5 mph becoming light and variable in the evening.

    Low: 77 °F

    Chance
    T-storms

  • Monday

    Monday: A 20 percent chance of showers and thunderstorms. Partly sunny, with a high near 94. Heat index values as high as 105. Light and variable wind becoming north around 6 mph in the morning.

    High: 94 °F

    Slight Chance
    T-storms

  • Monday Night

    Monday Night: Partly cloudy, with a low around 78. East wind around 5 mph becoming calm in the evening.

    Low: 78 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny and hot, with a high near 97.

    High: 97 °F

    Hot

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 78.

    Low: 78 °F

    Mostly Clear

  • Wednesday

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

    High: 99 °F

    Hot

Detailed Forecast

Overnight
Partly cloudy, with a low around 78. Light southwest wind.
Sunday
Mostly sunny and hot, with a high near 97. Heat index values as high as 107. Southwest wind 5 to 7 mph.
Sunday Night
A 40 percent chance of showers and thunderstorms, mainly after 7pm. Partly cloudy, with a low around 77. West wind around 5 mph becoming light and variable in the evening.
Monday
A 20 percent chance of showers and thunderstorms. Partly sunny, with a high near 94. Heat index values as high as 105. Light and variable wind becoming north around 6 mph in the morning.
Monday Night
Partly cloudy, with a low around 78. East wind around 5 mph becoming calm in the evening.
Tuesday
Mostly sunny and hot, with a high near 97.
Tuesday Night
Mostly clear, with a low around 78.
Wednesday
Sunny and hot, with a high near 99.
Wednesday Night
Mostly clear, with a low around 79.
Thursday
Sunny and hot, with a high near 99.
Thursday Night
Mostly clear, with a low around 78.
Friday
A 20 percent chance of showers and thunderstorms. Mostly sunny and hot, with a high near 98.
Friday Night
Partly cloudy, with a low around 79.
Saturday
A 20 percent chance of showers and thunderstorms. Mostly sunny and hot, with a high near 97.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Saint Louis MO
 38.64°N 90.23°W (Elev. 538 ft)
Last Update:
10:22 pm CDT Jul 19, 2025
Forecast Valid:
12am CDT Jul 20, 2025-6pm CDT Jul 26, 2025
 
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