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Hazardous Weather Conditions

Current conditions at

St. Louis Downtown Airport (KCPS)

Lat: 38.56°NLon: 90.15°WElev: 410ft.

Fair

75°F

24°C

Humidity 94%
Wind Speed SE 5 mph
Barometer 29.95 in (1013.7 mb)
Dewpoint 73°F (23°C)
Visibility 8.00 mi
Last update 29 Jun 5:53 am CDT
Extended Forecast for

Cahokia / St. Louis, St. Louis Downtown Airport IL

Extreme Heat Warning June 29, 06:14am until July 3, 10:00pm
Click here for hazard details and duration
Extreme Heat Warning
  •  
    Extreme Heat Warning June 29, 06:14am 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 76. South wind 5 to 11 mph.

    Low: 76 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny and hot, with a high near 98. Heat index values as high as 107. South wind 5 to 9 mph.

    High: 98 °F

    Hot

  • Tuesday Night

    Tuesday Night: Clear, with a low around 76. South wind 3 to 8 mph.

    Low: 76 °F

    Clear

  • Wednesday

    Wednesday: Sunny and hot, with a high near 97. Light south wind increasing to 5 to 9 mph in the morning.

    High: 97 °F

    Hot

  • Wednesday Night

    Wednesday Night: Clear, with a low around 77.

    Low: 77 °F

    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 78.

    Low: 78 °F

    Mostly Clear

Detailed Forecast

Today
Mostly sunny, with a high near 96. Heat index values as high as 109. South wind 6 to 11 mph, with gusts as high as 21 mph.
Tonight
Mostly clear, with a low around 76. South wind 5 to 11 mph.
Tuesday
Sunny and hot, with a high near 98. Heat index values as high as 107. South wind 5 to 9 mph.
Tuesday Night
Clear, with a low around 76. South wind 3 to 8 mph.
Wednesday
Sunny and hot, with a high near 97. Light south wind increasing to 5 to 9 mph in the morning.
Wednesday Night
Clear, with a low around 77.
Thursday
Sunny and hot, with a high near 97.
Thursday Night
Mostly clear, with a low around 78.
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
A 20 percent chance of showers and thunderstorms. Sunny, with a high near 96.
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 93.
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ABOUT THIS FORECAST

 
Point Forecast:
Cahokia / St. Louis, St. Louis Downtown Airport IL
 38.57°N 90.15°W (Elev. 407 ft)
Last Update:
2:41 am CDT Jun 29, 2026
Forecast Valid:
6am CDT Jun 29, 2026-6pm CDT Jul 5, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation