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

43°F

6°C

Humidity 93%
Wind Speed S 8 mph
Barometer 29.93 in (1013.4 mb)
Dewpoint 41°F (5°C)
Visibility 10.00 mi
Wind Chill38°F (3°C)
Last update 17 Feb 5:53 am CST
Extended Forecast for

Cahokia IL

  • Today

    Today: Mostly cloudy, with a high near 61. South wind 5 to 14 mph, with gusts as high as 26 mph.

    High: 61 °F

    Mostly Cloudy

  • Tonight

    Tonight: A slight chance of rain between 1am and 3am. Cloudy, then gradually becoming partly cloudy, with a low around 54. Southwest wind 13 to 17 mph, with gusts as high as 36 mph. Chance of precipitation is 20%.

    Low: 54 °F

    Mostly Cloudy
    then Slight
    Chance Rain

  • Wednesday

    Wednesday: Sunny, with a high near 73. Southwest wind 6 to 11 mph, with gusts as high as 23 mph.

    High: 73 °F

    Sunny

  • Wednesday Night

    Wednesday Night: A 20 percent chance of showers after midnight. Partly cloudy, with a low around 50. South wind around 5 mph.

    Low: 50 °F

    Mostly Clear
    then Slight
    Chance
    Showers

  • Thursday

    Thursday: A chance of showers, with thunderstorms also possible after noon. Mostly sunny, with a high near 74. South wind 6 to 14 mph becoming southwest in the afternoon. Winds could gust as high as 25 mph. Chance of precipitation is 40%.

    High: 74 °F

    Chance
    Showers then
    Chance
    T-storms

  • Thursday Night

    Thursday Night: A 20 percent chance of showers before midnight. Mostly clear, with a low around 38.

    Low: 38 °F

    Slight Chance
    Showers then
    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 52.

    High: 52 °F

    Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 32.

    Low: 32 °F

    Partly Cloudy

  • Saturday

    Saturday: A chance of snow before noon, then a chance of rain. Mostly sunny, with a high near 47. Chance of precipitation is 30%.

    High: 47 °F

    Chance Snow
    then Chance
    Rain

Detailed Forecast

Today
Mostly cloudy, with a high near 61. South wind 5 to 14 mph, with gusts as high as 26 mph.
Tonight
A slight chance of rain between 1am and 3am. Cloudy, then gradually becoming partly cloudy, with a low around 54. Southwest wind 13 to 17 mph, with gusts as high as 36 mph. Chance of precipitation is 20%.
Wednesday
Sunny, with a high near 73. Southwest wind 6 to 11 mph, with gusts as high as 23 mph.
Wednesday Night
A 20 percent chance of showers after midnight. Partly cloudy, with a low around 50. South wind around 5 mph.
Thursday
A chance of showers, with thunderstorms also possible after noon. Mostly sunny, with a high near 74. South wind 6 to 14 mph becoming southwest in the afternoon. Winds could gust as high as 25 mph. Chance of precipitation is 40%.
Thursday Night
A 20 percent chance of showers before midnight. Mostly clear, with a low around 38.
Friday
Sunny, with a high near 52.
Friday Night
Partly cloudy, with a low around 32.
Saturday
A chance of snow before noon, then a chance of rain. Mostly sunny, with a high near 47. Chance of precipitation is 30%.
Saturday Night
A 20 percent chance of snow before midnight. Mostly clear, with a low around 27.
Sunday
Sunny, with a high near 41.
Sunday Night
Mostly clear, with a low around 20.
Monday
Sunny, with a high near 41.
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:
5:01 am CST Feb 17, 2026
Forecast Valid:
6am CST Feb 17, 2026-6pm CST Feb 23, 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