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.

Overcast

23°F

-5°C

Humidity 78%
Wind Speed NE 8 mph
Barometer 30.51 in (1033.7 mb)
Dewpoint 17°F (-8°C)
Visibility 10.00 mi
Wind Chill14°F (-10°C)
Last update 30 Nov 11:53 pm CST
Extended Forecast for

Cahokia IL

  • Overnight

    Overnight: Cloudy, with a low around 21. East wind 3 to 5 mph.

    Low: 21 °F

    Cloudy

  • Monday

    Monday: A 30 percent chance of snow after 2pm. Cloudy, with a high near 32. East wind around 5 mph becoming calm.

    High: 32 °F

    Cloudy then
    Chance Snow

  • Monday Night

    Monday Night: Snow, mainly before 1am. Low around 22. Calm wind becoming northwest around 5 mph after midnight. Chance of precipitation is 90%. New snow accumulation of 1 to 2 inches possible.

    Low: 22 °F

    Snow then
    Snow Likely

  • Tuesday

    Tuesday: Mostly sunny, with a high near 33. Northwest wind around 6 mph becoming calm in the afternoon.

    High: 33 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 21. Calm wind becoming south around 5 mph after midnight.

    Low: 21 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 41.

    High: 41 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 16.

    Low: 16 °F

    Mostly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 24.

    High: 24 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: A 20 percent chance of snow after midnight. Mostly cloudy, with a low around 15.

    Low: 15 °F

    Mostly Cloudy
    then Slight
    Chance Snow

Detailed Forecast

Overnight
Cloudy, with a low around 21. East wind 3 to 5 mph.
Monday
A 30 percent chance of snow after 2pm. Cloudy, with a high near 32. East wind around 5 mph becoming calm.
Monday Night
Snow, mainly before 1am. Low around 22. Calm wind becoming northwest around 5 mph after midnight. Chance of precipitation is 90%. New snow accumulation of 1 to 2 inches possible.
Tuesday
Mostly sunny, with a high near 33. Northwest wind around 6 mph becoming calm in the afternoon.
Tuesday Night
Partly cloudy, with a low around 21. Calm wind becoming south around 5 mph after midnight.
Wednesday
Mostly sunny, with a high near 41.
Wednesday Night
Mostly cloudy, with a low around 16.
Thursday
Mostly sunny, with a high near 24.
Thursday Night
A 20 percent chance of snow after midnight. Mostly cloudy, with a low around 15.
Friday
A chance of snow before noon, then a chance of rain and snow. Mostly cloudy, with a high near 33. Chance of precipitation is 40%.
Friday Night
A slight chance of freezing rain. Mostly cloudy, with a low around 25. Chance of precipitation is 20%.
Saturday
Mostly cloudy, with a high near 39.
Saturday Night
Mostly cloudy, with a low around 27.
Sunday
Mostly cloudy, with a high near 37.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Cahokia IL
 38.55°N 90.15°W (Elev. 407 ft)
Last Update:
10:31 pm CST Nov 30, 2025
Forecast Valid:
12am CST Dec 1, 2025-6pm CST Dec 7, 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