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

-1°F

-18°C

Humidity 91%
Wind Speed Calm
Barometer 30.44 in (1031.7 mb)
Dewpoint -3°F (-19°C)
Visibility 10.00 mi
Last update 1 Feb 5:53 am CST
Extended Forecast for

Cahokia IL

  • Today

    Today: A slight chance of snow before 1pm, then a chance of snow after 2pm. Increasing clouds, with a high near 29. Calm wind becoming south 5 to 9 mph in the morning. Chance of precipitation is 40%.

    High: 29 °F

    Mostly Sunny
    then Chance
    Snow

  • Tonight

    Tonight: A 40 percent chance of snow, mainly before 7pm. Cloudy, then gradually becoming partly cloudy, with a low around 18. South wind 5 to 7 mph becoming light and variable after midnight.

    Low: 18 °F

    Chance Snow
    then Mostly
    Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 39. West wind around 6 mph becoming calm in the afternoon.

    High: 39 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 26. Calm wind.

    Low: 26 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 35. Calm wind becoming north 5 to 7 mph in the morning.

    High: 35 °F

    Mostly Cloudy

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 18.

    Low: 18 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 31.

    High: 31 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 14.

    Low: 14 °F

    Mostly Clear

  • Thursday

    Thursday: Mostly sunny, with a high near 40.

    High: 40 °F

    Mostly Sunny

Detailed Forecast

Today
A slight chance of snow before 1pm, then a chance of snow after 2pm. Increasing clouds, with a high near 29. Calm wind becoming south 5 to 9 mph in the morning. Chance of precipitation is 40%.
Tonight
A 40 percent chance of snow, mainly before 7pm. Cloudy, then gradually becoming partly cloudy, with a low around 18. South wind 5 to 7 mph becoming light and variable after midnight.
Monday
Mostly sunny, with a high near 39. West wind around 6 mph becoming calm in the afternoon.
Monday Night
Mostly cloudy, with a low around 26. Calm wind.
Tuesday
Mostly cloudy, with a high near 35. Calm wind becoming north 5 to 7 mph in the morning.
Tuesday Night
Mostly cloudy, with a low around 18.
Wednesday
Mostly sunny, with a high near 31.
Wednesday Night
Mostly clear, with a low around 14.
Thursday
Mostly sunny, with a high near 40.
Thursday Night
Partly cloudy, with a low around 31.
Friday
Mostly sunny, with a high near 47.
Friday Night
Partly cloudy, with a low around 21.
Saturday
Mostly sunny, with a high near 34.
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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:
6:46 am CST Feb 1, 2026
Forecast Valid:
6am CST Feb 1, 2026-6pm CST Feb 7, 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