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.

34°F

1°C

Humidity 92%
Wind Speed Calm
Barometer 29.91 in (1013.0 mb)
Dewpoint 32°F (0°C)
Visibility 10.00 mi
Last update 10 Feb 2:53 am CST
Extended Forecast for

Cahokia IL

  • Today

    Today: Sunny, with a high near 63. South wind 6 to 10 mph becoming north in the afternoon.

    High: 63 °F

    Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 31. North wind around 6 mph.

    Low: 31 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Sunny, with a high near 51. North wind 3 to 5 mph.

    High: 51 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Increasing clouds, with a low around 31. Calm wind.

    Low: 31 °F

    Increasing
    Clouds

  • Thursday

    Thursday: A 20 percent chance of rain after noon. Cloudy, with a high near 49. Calm wind becoming southeast 5 to 7 mph in the morning.

    High: 49 °F

    Mostly Cloudy
    then Slight
    Chance Rain

  • Thursday Night

    Thursday Night: A 20 percent chance of rain before midnight. Mostly cloudy, with a low around 34.

    Low: 34 °F

    Slight Chance
    Rain then
    Mostly Cloudy

  • Friday

    Friday: Partly sunny, with a high near 51.

    High: 51 °F

    Partly Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 36.

    Low: 36 °F

    Mostly Cloudy

  • Saturday

    Saturday: A 50 percent chance of rain, mainly after noon. Cloudy, with a high near 50.

    High: 50 °F

    Slight Chance
    Rain then
    Chance Rain

Detailed Forecast

Today
Sunny, with a high near 63. South wind 6 to 10 mph becoming north in the afternoon.
Tonight
Partly cloudy, with a low around 31. North wind around 6 mph.
Wednesday
Sunny, with a high near 51. North wind 3 to 5 mph.
Wednesday Night
Increasing clouds, with a low around 31. Calm wind.
Thursday
A 20 percent chance of rain after noon. Cloudy, with a high near 49. Calm wind becoming southeast 5 to 7 mph in the morning.
Thursday Night
A 20 percent chance of rain before midnight. Mostly cloudy, with a low around 34.
Friday
Partly sunny, with a high near 51.
Friday Night
Mostly cloudy, with a low around 36.
Saturday
A 50 percent chance of rain, mainly after noon. Cloudy, with a high near 50.
Saturday Night
Rain likely, mainly before midnight. Mostly cloudy, with a low around 39. Chance of precipitation is 60%.
Sunday
A 40 percent chance of rain. Mostly sunny, with a high near 53.
Sunday Night
Mostly clear, with a low around 35.
Washington's Birthday
Mostly sunny, with a high near 60.
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:
3:57 am CST Feb 10, 2026
Forecast Valid:
4am CST Feb 10, 2026-6pm CST Feb 16, 2026
 
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