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

47°F

8°C

Humidity 61%
Wind Speed SE 10 mph
Barometer 29.90 in (1012.6 mb)
Dewpoint 34°F (1°C)
Visibility 10.00 mi
Wind Chill42°F (6°C)
Last update 26 Feb 9:53 am CST
Extended Forecast for

Cahokia IL

  • Today

    Today: Sunny, with a high near 57. Southeast wind around 6 mph becoming light and variable in the afternoon.

    High: 57 °F

    Sunny

  • Tonight

    Tonight: Clear, with a low around 37. Light southwest wind.

    Low: 37 °F

    Clear

  • Friday

    Friday: Sunny, with a high near 75. Light southwest wind increasing to 10 to 15 mph in the morning. Winds could gust as high as 23 mph.

    High: 75 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 42. South wind around 6 mph becoming light and variable after midnight.

    Low: 42 °F

    Mostly Clear

  • Saturday

    Saturday: Mostly sunny, with a high near 66. Light and variable wind becoming southeast 5 to 10 mph in the morning.

    High: 66 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: A 20 percent chance of rain. Partly cloudy, with a low around 31.

    Low: 31 °F

    Slight Chance
    Rain

  • Sunday

    Sunday: Rain and snow likely, mainly after noon. Cloudy, with a high near 41. Chance of precipitation is 60%.

    High: 41 °F

    Chance
    Rain/Snow
    then
    Rain/Snow
    Likely

  • Sunday Night

    Sunday Night: Rain and snow, mainly before midnight. Low around 27. Chance of precipitation is 80%.

    Low: 27 °F

    Rain/Snow
    then Chance
    Rain/Snow

  • Monday

    Monday: A chance of rain and snow before noon, then a slight chance of rain. Cloudy, with a high near 42. Chance of precipitation is 30%.

    High: 42 °F

    Chance
    Rain/Snow
    then Slight
    Chance Rain

Detailed Forecast

Today
Sunny, with a high near 57. Southeast wind around 6 mph becoming light and variable in the afternoon.
Tonight
Clear, with a low around 37. Light southwest wind.
Friday
Sunny, with a high near 75. Light southwest wind increasing to 10 to 15 mph in the morning. Winds could gust as high as 23 mph.
Friday Night
Mostly clear, with a low around 42. South wind around 6 mph becoming light and variable after midnight.
Saturday
Mostly sunny, with a high near 66. Light and variable wind becoming southeast 5 to 10 mph in the morning.
Saturday Night
A 20 percent chance of rain. Partly cloudy, with a low around 31.
Sunday
Rain and snow likely, mainly after noon. Cloudy, with a high near 41. Chance of precipitation is 60%.
Sunday Night
Rain and snow, mainly before midnight. Low around 27. Chance of precipitation is 80%.
Monday
A chance of rain and snow before noon, then a slight chance of rain. Cloudy, with a high near 42. Chance of precipitation is 30%.
Monday Night
A 40 percent chance of rain. Mostly cloudy, with a low around 27.
Tuesday
A 40 percent chance of rain. Cloudy, with a high near 44.
Tuesday Night
A 40 percent chance of rain. Mostly cloudy, with a low around 31.
Wednesday
A 40 percent chance of rain. Mostly cloudy, with a high near 53.
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:
8:36 am CST Feb 26, 2026
Forecast Valid:
10am CST Feb 26, 2026-6pm CST Mar 4, 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