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

21°F

-6°C

Humidity 59%
Wind Speed NE 6 mph
Barometer 30.39 in (1029.5 mb)
Dewpoint 9°F (-13°C)
Visibility 10.00 mi
Wind Chill13°F (-11°C)
Last update 4 Dec 11:53 am CST
Extended Forecast for

Cahokia IL

  • This Afternoon

    This Afternoon: Partly sunny, with a high near 25. North wind 5 to 8 mph.

    High: 25 °F

    Partly Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 12. Light and variable wind.

    Low: 12 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 39. Calm wind becoming south around 6 mph in the morning.

    High: 39 °F

    Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 28. South wind around 6 mph becoming calm after midnight.

    Low: 28 °F

    Mostly Cloudy

  • Saturday

    Saturday: Partly sunny, with a high near 39. Calm wind becoming north around 5 mph in the afternoon.

    High: 39 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: A chance of freezing rain between midnight and 3am, then a chance of snow after 3am. Cloudy, with a low around 28. Chance of precipitation is 30%.

    Low: 28 °F

    Mostly Cloudy
    then Chance
    Wintry Mix

  • Sunday

    Sunday: A slight chance of rain and snow before noon. Mostly cloudy, with a high near 34. Chance of precipitation is 20%.

    High: 34 °F

    Slight Chance
    Rain/Snow
    then Mostly
    Cloudy

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 19.

    Low: 19 °F

    Mostly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 33.

    High: 33 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
Partly sunny, with a high near 25. North wind 5 to 8 mph.
Tonight
Mostly clear, with a low around 12. Light and variable wind.
Friday
Sunny, with a high near 39. Calm wind becoming south around 6 mph in the morning.
Friday Night
Mostly cloudy, with a low around 28. South wind around 6 mph becoming calm after midnight.
Saturday
Partly sunny, with a high near 39. Calm wind becoming north around 5 mph in the afternoon.
Saturday Night
A chance of freezing rain between midnight and 3am, then a chance of snow after 3am. Cloudy, with a low around 28. Chance of precipitation is 30%.
Sunday
A slight chance of rain and snow before noon. Mostly cloudy, with a high near 34. Chance of precipitation is 20%.
Sunday Night
Mostly cloudy, with a low around 19.
Monday
Mostly sunny, with a high near 33.
Monday Night
Partly cloudy, with a low around 24.
Tuesday
Partly sunny, with a high near 45.
Tuesday Night
Mostly cloudy, with a low around 32.
Wednesday
A 20 percent chance of rain. Mostly cloudy, with a high near 48.
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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:
11:21 am CST Dec 4, 2025
Forecast Valid:
12pm CST Dec 4, 2025-6pm CST Dec 10, 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