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

50°F

10°C

Humidity 100%
Wind Speed Calm
Barometer 29.98 in (1015.0 mb)
Dewpoint 50°F (10°C)
Visibility 10.00 mi
Last update 11 Oct 3:53 am CDT
Extended Forecast for

Cahokia IL

  • Today

    Today: Sunny, with a high near 88. Light and variable wind.

    High: 88 °F

    Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 63. Southeast wind around 6 mph becoming southwest after midnight.

    Low: 63 °F

    Partly Cloudy

  • Columbus Day

    Columbus Day: Sunny, with a high near 94. Southwest wind 6 to 11 mph, with gusts as high as 20 mph.

    High: 94 °F

    Sunny

  • Monday Night

    Monday Night: Clear, with a low around 68. Southwest wind 7 to 9 mph.

    Low: 68 °F

    Clear

  • Tuesday

    Tuesday: Sunny, with a high near 94. Southwest wind 7 to 9 mph.

    High: 94 °F

    Sunny

  • Tuesday Night

    Tuesday Night: A 50 percent chance of showers and thunderstorms, mainly after 1am. Partly cloudy, with a low around 68.

    Low: 68 °F

    Slight Chance
    T-storms then
    Chance
    T-storms

  • Wednesday

    Wednesday: Showers and possibly a thunderstorm. High near 83. Chance of precipitation is 80%.

    High: 83 °F

    Showers

  • Wednesday Night

    Wednesday Night: A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 61.

    Low: 61 °F

    Chance
    Showers

  • Thursday

    Thursday: Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 79. Chance of precipitation is 70%.

    High: 79 °F

    Showers
    Likely

Detailed Forecast

Today
Sunny, with a high near 88. Light and variable wind.
Tonight
Partly cloudy, with a low around 63. Southeast wind around 6 mph becoming southwest after midnight.
Columbus Day
Sunny, with a high near 94. Southwest wind 6 to 11 mph, with gusts as high as 20 mph.
Monday Night
Clear, with a low around 68. Southwest wind 7 to 9 mph.
Tuesday
Sunny, with a high near 94. Southwest wind 7 to 9 mph.
Tuesday Night
A 50 percent chance of showers and thunderstorms, mainly after 1am. Partly cloudy, with a low around 68.
Wednesday
Showers and possibly a thunderstorm. High near 83. Chance of precipitation is 80%.
Wednesday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 61.
Thursday
Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 79. Chance of precipitation is 70%.
Thursday Night
A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 52.
Friday
A 20 percent chance of showers. Partly sunny, with a high near 68.
Friday Night
Partly cloudy, with a low around 40.
Saturday
Sunny, with a high near 62.
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 90.15°W (Elev. 407 ft)
Last Update:
3:16 am CDT Oct 11, 2026
Forecast Valid:
4am CDT Oct 11, 2026-6pm CDT Oct 17, 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