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

39°F

4°C

Humidity 67%
Wind Speed NW 8 mph
Barometer 30.27 in (1025.3 mb)
Dewpoint 29°F (-2°C)
Visibility 10.00 mi
Wind Chill33°F (1°C)
Last update 11 Mar 11:53 pm CDT
Extended Forecast for

Cahokia IL

  • Overnight

    Overnight: Mostly clear, with a low around 32. Northwest wind 6 to 10 mph, with gusts as high as 20 mph.

    Low: 32 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 56. Calm wind becoming southwest 5 to 8 mph in the morning.

    High: 56 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 44. South wind 10 to 16 mph, with gusts as high as 29 mph.

    Low: 44 °F

    Mostly Clear

  • Friday

    Friday: Partly sunny, with a high near 62. Southwest wind 9 to 14 mph, with gusts as high as 23 mph.

    High: 62 °F

    Partly Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 36. Northwest wind around 6 mph becoming light and variable.

    Low: 36 °F

    Mostly Cloudy

  • Saturday

    Saturday: Partly sunny, with a high near 62.

    High: 62 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 51.

    Low: 51 °F

    Mostly Cloudy

  • Sunday

    Sunday: Rain likely and possibly a thunderstorm, then rain after 1pm. High near 67. Breezy. Chance of precipitation is 80%.

    High: 67 °F

    Rain and
    Breezy

  • Sunday Night

    Sunday Night: A chance of rain and snow before 1am. Mostly cloudy, with a low around 25. Blustery. Chance of precipitation is 30%.

    Low: 25 °F

    Chance
    Rain/Snow and
    Blustery

Detailed Forecast

Overnight
Mostly clear, with a low around 32. Northwest wind 6 to 10 mph, with gusts as high as 20 mph.
Thursday
Sunny, with a high near 56. Calm wind becoming southwest 5 to 8 mph in the morning.
Thursday Night
Mostly clear, with a low around 44. South wind 10 to 16 mph, with gusts as high as 29 mph.
Friday
Partly sunny, with a high near 62. Southwest wind 9 to 14 mph, with gusts as high as 23 mph.
Friday Night
Mostly cloudy, with a low around 36. Northwest wind around 6 mph becoming light and variable.
Saturday
Partly sunny, with a high near 62.
Saturday Night
Mostly cloudy, with a low around 51.
Sunday
Rain likely and possibly a thunderstorm, then rain after 1pm. High near 67. Breezy. Chance of precipitation is 80%.
Sunday Night
A chance of rain and snow before 1am. Mostly cloudy, with a low around 25. Blustery. Chance of precipitation is 30%.
Monday
Mostly sunny, with a high near 38.
Monday Night
Mostly clear, with a low around 18.
Tuesday
Partly sunny, with a high near 44.
Tuesday Night
A slight chance of rain and snow. Mostly cloudy, with a low around 33. Chance of precipitation is 20%.
Wednesday
Partly sunny, with a high near 57.
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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:
10:31 pm CDT Mar 11, 2026
Forecast Valid:
12am CDT Mar 12, 2026-6pm CDT Mar 18, 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