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.

Overcast

41°F

5°C

Humidity 62%
Wind Speed N 17 G 26 mph
Barometer 30.26 in (1024.7 mb)
Dewpoint 29°F (-2°C)
Visibility 10.00 mi
Wind Chill33°F (1°C)
Last update 23 Mar 4:53 am CDT
Extended Forecast for

Cahokia IL

  • Today

    Today: Mostly sunny, with a high near 55. North wind around 10 mph, with gusts as high as 21 mph.

    High: 55 °F

    Mostly Sunny

  • Tonight

    Tonight: A chance of sprinkles after 2am. Mostly cloudy, with a low around 38. East wind 5 to 7 mph.

    Low: 38 °F

    Chance
    Sprinkles

  • Tuesday

    Tuesday: Mostly sunny, with a high near 63. Southeast wind 6 to 8 mph.

    High: 63 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 42. Southeast wind around 6 mph becoming calm after midnight.

    Low: 42 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 76. Calm wind becoming south 5 to 9 mph in the morning.

    High: 76 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 61.

    Low: 61 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 90.

    High: 90 °F

    Sunny

  • Thursday Night

    Thursday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 44. Chance of precipitation is 70%.

    Low: 44 °F

    Chance
    T-storms then
    Showers
    Likely

  • Friday

    Friday: A 40 percent chance of showers, mainly before 1pm. Mostly cloudy, with a high near 54.

    High: 54 °F

    Chance
    Showers

Detailed Forecast

Today
Mostly sunny, with a high near 55. North wind around 10 mph, with gusts as high as 21 mph.
Tonight
A chance of sprinkles after 2am. Mostly cloudy, with a low around 38. East wind 5 to 7 mph.
Tuesday
Mostly sunny, with a high near 63. Southeast wind 6 to 8 mph.
Tuesday Night
Partly cloudy, with a low around 42. Southeast wind around 6 mph becoming calm after midnight.
Wednesday
Mostly sunny, with a high near 76. Calm wind becoming south 5 to 9 mph in the morning.
Wednesday Night
Mostly clear, with a low around 61.
Thursday
Sunny, with a high near 90.
Thursday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 44. Chance of precipitation is 70%.
Friday
A 40 percent chance of showers, mainly before 1pm. Mostly cloudy, with a high near 54.
Friday Night
Partly cloudy, with a low around 33.
Saturday
Sunny, with a high near 58.
Saturday Night
Partly cloudy, with a low around 38.
Sunday
Mostly sunny, with a high near 65.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Cahokia IL
 38.57°N 90.18°W (Elev. 407 ft)
Last Update:
3:41 am CDT Mar 23, 2026
Forecast Valid:
5am CDT Mar 23, 2026-6pm CDT Mar 29, 2026
 
Forecast Discussion
 
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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