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.

A Few Clouds

24°F

-4°C

Humidity 81%
Wind Speed S 3 mph
Barometer 30.12 in (1020.5 mb)
Dewpoint 19°F (-7°C)
Visibility 10.00 mi
Last update 2 Dec 8:53 pm CST
Extended Forecast for

Cahokia IL

  • Tonight

    Tonight: Mostly cloudy, then gradually becoming clear, with a low around 20. Light south wind.

    Low: 20 °F

    Decreasing
    Clouds

  • Wednesday

    Wednesday: Increasing clouds, with a high near 42. Light and variable wind becoming southwest around 6 mph in the morning.

    High: 42 °F

    Increasing
    Clouds

  • Wednesday Night

    Wednesday Night: A 20 percent chance of snow after midnight. Cloudy, with a low around 16. North wind 5 to 9 mph.

    Low: 16 °F

    Cloudy then
    Slight Chance
    Snow

  • Thursday

    Thursday: Mostly sunny, with a high near 24. North wind 5 to 7 mph becoming calm in the afternoon.

    High: 24 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 14. Calm wind.

    Low: 14 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 39.

    High: 39 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 24.

    Low: 24 °F

    Partly Cloudy

  • Saturday

    Saturday: Partly sunny, with a high near 39.

    High: 39 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 26.

    Low: 26 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Mostly cloudy, then gradually becoming clear, with a low around 20. Light south wind.
Wednesday
Increasing clouds, with a high near 42. Light and variable wind becoming southwest around 6 mph in the morning.
Wednesday Night
A 20 percent chance of snow after midnight. Cloudy, with a low around 16. North wind 5 to 9 mph.
Thursday
Mostly sunny, with a high near 24. North wind 5 to 7 mph becoming calm in the afternoon.
Thursday Night
Partly cloudy, with a low around 14. Calm wind.
Friday
Mostly sunny, with a high near 39.
Friday Night
Partly cloudy, with a low around 24.
Saturday
Partly sunny, with a high near 39.
Saturday Night
Mostly cloudy, with a low around 26.
Sunday
A slight chance of rain and snow after noon. Mostly cloudy, with a high near 36. Chance of precipitation is 20%.
Sunday Night
Mostly cloudy, with a low around 21.
Monday
Partly sunny, with a high near 35.
Monday Night
A 20 percent chance of snow. Mostly cloudy, with a low around 28.
Tuesday
Partly sunny, with a high near 43.
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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:
8:51 pm CST Dec 2, 2025
Forecast Valid:
9pm CST Dec 2, 2025-6pm CST Dec 9, 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