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

Hazardous Weather Conditions

Current conditions at

St. Louis Downtown Airport (KCPS)

Lat: 38.56°NLon: 90.15°WElev: 410ft.

Fair

82°F

28°C

Humidity 82%
Wind Speed S 6 mph
Barometer 29.87 in (1011.1 mb)
Dewpoint 76°F (24°C)
Visibility 10.00 mi
Heat Index89°F (32°C)
Last update 28 Jun 9:53 pm CDT
Extended Forecast for

Cahokia IL

Extreme Heat Warning June 28, 10:42pm until July 3, 12:00am
Click here for hazard details and duration
Extreme Heat Warning
  •  
    Extreme Heat Warning June 28, 10:42pm until July 3, 12:00am

    NOW until 12:00am Fri

    Extreme Heat Warning

  • Tonight

    Low: 76 °F

    Increasing
    Clouds

  • Monday

    Monday: Mostly sunny and hot, with a high near 98. Heat index values as high as 113. South wind 6 to 11 mph, with gusts as high as 20 mph.

    High: 98 °F

    Hot

  • Monday Night

    Monday Night: Mostly clear, with a low around 78. South wind 5 to 10 mph becoming light after midnight.

    Low: 78 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny and hot, with a high near 99. Heat index values as high as 111. Light south wind increasing to 5 to 9 mph in the morning.

    High: 99 °F

    Hot

  • Tuesday Night

    Tuesday Night: Clear, with a low around 77. South wind 3 to 7 mph.

    Low: 77 °F

    Clear

  • Wednesday

    Wednesday: Sunny and hot, with a high near 98.

    High: 98 °F

    Hot

  • Wednesday Night

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

    Low: 79 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny and hot, with a high near 98.

    High: 98 °F

    Hot

Detailed Forecast

Tonight
Increasing clouds, with a low around 76. South wind 5 to 7 mph.
Monday
Mostly sunny and hot, with a high near 98. Heat index values as high as 113. South wind 6 to 11 mph, with gusts as high as 20 mph.
Monday Night
Mostly clear, with a low around 78. South wind 5 to 10 mph becoming light after midnight.
Tuesday
Sunny and hot, with a high near 99. Heat index values as high as 111. Light south wind increasing to 5 to 9 mph in the morning.
Tuesday Night
Clear, with a low around 77. South wind 3 to 7 mph.
Wednesday
Sunny and hot, with a high near 98.
Wednesday Night
Mostly clear, with a low around 79.
Thursday
Sunny and hot, with a high near 98.
Thursday Night
Mostly clear, with a low around 78.
Friday
Sunny and hot, with a high near 98.
Friday Night
Mostly clear, with a low around 78.
Independence Day
Sunny and hot, with a high near 98.
Saturday Night
Mostly clear, with a low around 77.
Sunday
A 20 percent chance of showers and thunderstorms. Sunny, with a high near 96.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Cahokia IL
 38.57°N 90.18°W (Elev. 407 ft)
Last Update:
10:26 pm CDT Jun 28, 2026
Forecast Valid:
10pm CDT Jun 28, 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