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

St. Louis Downtown Airport (KCPS)

Lat: 38.56°NLon: 90.15°WElev: 410ft.

Fair

22°F

-6°C

Humidity 82%
Wind Speed Calm
Barometer 30.20 in (1023.3 mb)
Dewpoint 17°F (-8°C)
Visibility 8.00 mi
Last update 5 Feb 8:53 am CST
Extended Forecast for

Cahokia IL

  • Today

    Today: Mostly cloudy, with a high near 40. South wind 3 to 8 mph.

    High: 40 °F

    Mostly Cloudy

  • Tonight

    Tonight: Mostly cloudy, then gradually becoming mostly clear, with a low around 30. Light and variable wind becoming west around 6 mph after midnight.

    Low: 30 °F

    Decreasing
    Clouds

  • Friday

    Friday: Increasing clouds, with a high near 48. West wind 6 to 13 mph becoming northwest in the afternoon. Winds could gust as high as 22 mph.

    High: 48 °F

    Increasing
    Clouds

  • Friday Night

    Friday Night: Partly cloudy, with a low around 25. Northwest wind 5 to 9 mph becoming light north after midnight.

    Low: 25 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 38. Light and variable wind becoming southeast around 6 mph in the morning.

    High: 38 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 27.

    Low: 27 °F

    Mostly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 57.

    High: 57 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 33.

    Low: 33 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 61.

    High: 61 °F

    Sunny

Detailed Forecast

Today
Mostly cloudy, with a high near 40. South wind 3 to 8 mph.
Tonight
Mostly cloudy, then gradually becoming mostly clear, with a low around 30. Light and variable wind becoming west around 6 mph after midnight.
Friday
Increasing clouds, with a high near 48. West wind 6 to 13 mph becoming northwest in the afternoon. Winds could gust as high as 22 mph.
Friday Night
Partly cloudy, with a low around 25. Northwest wind 5 to 9 mph becoming light north after midnight.
Saturday
Mostly sunny, with a high near 38. Light and variable wind becoming southeast around 6 mph in the morning.
Saturday Night
Mostly cloudy, with a low around 27.
Sunday
Mostly sunny, with a high near 57.
Sunday Night
Mostly clear, with a low around 33.
Monday
Sunny, with a high near 61.
Monday Night
Mostly clear, with a low around 43.
Tuesday
A 20 percent chance of rain. Partly sunny, with a high near 65.
Tuesday Night
A 40 percent chance of rain. Mostly cloudy, with a low around 41.
Wednesday
A 30 percent chance of rain. Mostly cloudy, with a high near 57.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Cahokia IL
 38.57°N 90.18°W (Elev. 407 ft)
Last Update:
3:51 am CST Feb 5, 2026
Forecast Valid:
8am CST Feb 5, 2026-6pm CST Feb 11, 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