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.

Mostly Cloudy

88°F

31°C

Humidity 68%
Wind Speed S 10 mph
Barometer 29.98 in (1013.6 mb)
Dewpoint 76°F (24°C)
Visibility 10.00 mi
Heat Index99°F (37°C)
Last update 29 Jun 10:51 am CDT
Extended Forecast for

2 Miles W Saint Charles MO

Extreme Heat Warning June 29, 11:49am until July 3, 10:00pm
Click here for hazard details and duration
Extreme Heat Warning
  •  
    Extreme Heat Warning June 29, 11:49am until July 3, 10:00pm

    NOW until 10:00pm Fri

    Extreme Heat Warning

  • Today

    High: 96 °F

    Mostly Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 77. South wind 6 to 9 mph.

    Low: 77 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny and hot, with a high near 97. Heat index values as high as 107. Southwest wind 6 to 8 mph.

    High: 97 °F

    Hot

  • Tuesday Night

    Tuesday Night: Clear, with a low around 76. South wind 5 to 7 mph.

    Low: 76 °F

    Clear

  • Wednesday

    Wednesday: Sunny and hot, with a high near 97. Southwest wind around 6 mph.

    High: 97 °F

    Hot

  • Wednesday Night

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

    Low: 78 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny and hot, with a high near 97.

    High: 97 °F

    Hot

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 77.

    Low: 77 °F

    Mostly Clear

Detailed Forecast

Today
Mostly sunny, with a high near 96. Heat index values as high as 107. South wind around 10 mph, with gusts as high as 20 mph.
Tonight
Mostly clear, with a low around 77. South wind 6 to 9 mph.
Tuesday
Sunny and hot, with a high near 97. Heat index values as high as 107. Southwest wind 6 to 8 mph.
Tuesday Night
Clear, with a low around 76. South wind 5 to 7 mph.
Wednesday
Sunny and hot, with a high near 97. Southwest wind around 6 mph.
Wednesday Night
Mostly clear, with a low around 78.
Thursday
Sunny and hot, with a high near 97.
Thursday Night
Mostly clear, with a low around 77.
Friday
A 20 percent chance of showers and thunderstorms after 1pm. Sunny, with a high near 96.
Friday Night
Mostly clear, with a low around 77.
Independence Day
Sunny, with a high near 95.
Saturday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 76.
Sunday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 92.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
2 Miles W Saint Charles MO
 38.78°N 90.54°W (Elev. 515 ft)
Last Update:
9:21 am CDT Jun 29, 2026
Forecast Valid:
11am CDT Jun 29, 2026-6pm CDT Jul 5, 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