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

26°F

-3°C

Humidity 63%
Wind Speed Calm
Barometer 30.08 in (1019.3 mb)
Dewpoint 15°F (-9°C)
Visibility 10.00 mi
Last update 5 Dec 9:53 am CST
Extended Forecast for

Cahokia IL

  • Today

    Today: Sunny, with a high near 41. South wind around 7 mph.

    High: 41 °F

    Sunny

  • Tonight

    Tonight: Increasing clouds, with a low around 29. South wind around 6 mph becoming west after midnight.

    Low: 29 °F

    Increasing
    Clouds

  • Saturday

    Saturday: Partly sunny, with a high near 40. Calm wind becoming east around 5 mph in the afternoon.

    High: 40 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: A 40 percent chance of rain after midnight. Mostly cloudy, with a low around 31. East wind 3 to 5 mph.

    Low: 31 °F

    Mostly Cloudy
    then Chance
    Rain

  • Sunday

    Sunday: A slight chance of rain, mixing with snow after 9am, then gradually ending. Cloudy, with a high near 40. Light and variable wind becoming north 6 to 11 mph in the morning. Winds could gust as high as 20 mph. Chance of precipitation is 20%.

    High: 40 °F

    Slight Chance
    Rain/Snow
    then Cloudy

  • Sunday Night

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

    Low: 16 °F

    Mostly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 33.

    High: 33 °F

    Mostly Sunny

  • Monday Night

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

    Low: 24 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 48.

    High: 48 °F

    Mostly Sunny

Detailed Forecast

Today
Sunny, with a high near 41. South wind around 7 mph.
Tonight
Increasing clouds, with a low around 29. South wind around 6 mph becoming west after midnight.
Saturday
Partly sunny, with a high near 40. Calm wind becoming east around 5 mph in the afternoon.
Saturday Night
A 40 percent chance of rain after midnight. Mostly cloudy, with a low around 31. East wind 3 to 5 mph.
Sunday
A slight chance of rain, mixing with snow after 9am, then gradually ending. Cloudy, with a high near 40. Light and variable wind becoming north 6 to 11 mph in the morning. Winds could gust as high as 20 mph. Chance of precipitation is 20%.
Sunday Night
Mostly cloudy, with a low around 16.
Monday
Mostly sunny, with a high near 33.
Monday Night
Partly cloudy, with a low around 24.
Tuesday
Mostly sunny, with a high near 48.
Tuesday Night
Mostly cloudy, with a low around 37.
Wednesday
A 20 percent chance of rain. Mostly cloudy, with a high near 48.
Wednesday Night
Mostly cloudy, with a low around 23.
Thursday
Mostly cloudy, with a high near 35.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Cahokia IL
 38.57°N 90.18°W (Elev. 407 ft)
Last Update:
9:31 am CST Dec 5, 2025
Forecast Valid:
10am CST Dec 5, 2025-6pm CST Dec 11, 2025
 
Forecast Discussion
 
Get as KML Get as XML

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