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

34°F

1°C

Humidity 97%
Wind Speed Calm
Barometer 29.94 in (1013.8 mb)
Dewpoint 33°F (1°C)
Visibility 10.00 mi
Last update 26 Feb 11:53 pm CST
Extended Forecast for

Cahokia IL

  • Overnight

    Overnight: Clear, with a low around 37. Southwest wind around 6 mph.

    Low: 37 °F

    Clear

  • Friday

    Friday: Sunny, with a high near 72. Southwest wind 5 to 14 mph, with gusts as high as 24 mph.

    High: 72 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 41. Southwest wind 5 to 7 mph becoming light and variable after midnight.

    Low: 41 °F

    Mostly Clear

  • Saturday

    Saturday: A 20 percent chance of rain after noon. Mostly sunny, with a high near 67. Light and variable wind becoming south 5 to 7 mph in the morning.

    High: 67 °F

    Mostly Sunny
    then Slight
    Chance Rain

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 31. North wind 7 to 10 mph, with gusts as high as 20 mph.

    Low: 31 °F

    Partly Cloudy

  • Sunday

    Sunday: A 20 percent chance of rain after noon. Mostly cloudy, with a high near 47.

    High: 47 °F

    Mostly Cloudy
    then Slight
    Chance Rain

  • Sunday Night

    Sunday Night: Rain and snow. Low around 33. Chance of precipitation is 80%.

    Low: 33 °F

    Rain/Snow

  • Monday

    Monday: A chance of rain and snow before noon, then a slight chance of rain. Mostly cloudy, with a high near 45. Chance of precipitation is 30%.

    High: 45 °F

    Chance
    Rain/Snow
    then Slight
    Chance Rain

  • Monday Night

    Monday Night: A 50 percent chance of rain. Cloudy, with a low around 36.

    Low: 36 °F

    Chance Rain

Detailed Forecast

Overnight
Clear, with a low around 37. Southwest wind around 6 mph.
Friday
Sunny, with a high near 72. Southwest wind 5 to 14 mph, with gusts as high as 24 mph.
Friday Night
Mostly clear, with a low around 41. Southwest wind 5 to 7 mph becoming light and variable after midnight.
Saturday
A 20 percent chance of rain after noon. Mostly sunny, with a high near 67. Light and variable wind becoming south 5 to 7 mph in the morning.
Saturday Night
Partly cloudy, with a low around 31. North wind 7 to 10 mph, with gusts as high as 20 mph.
Sunday
A 20 percent chance of rain after noon. Mostly cloudy, with a high near 47.
Sunday Night
Rain and snow. Low around 33. Chance of precipitation is 80%.
Monday
A chance of rain and snow before noon, then a slight chance of rain. Mostly cloudy, with a high near 45. Chance of precipitation is 30%.
Monday Night
A 50 percent chance of rain. Cloudy, with a low around 36.
Tuesday
Rain. High near 54. Chance of precipitation is 80%.
Tuesday Night
Rain likely and possibly a thunderstorm. Cloudy, with a low around 43. Chance of precipitation is 70%.
Wednesday
Rain likely. Cloudy, with a high near 63. Chance of precipitation is 60%.
Wednesday Night
Rain likely and possibly a thunderstorm. Cloudy, with a low around 52. Chance of precipitation is 70%.
Thursday
Rain likely. Partly sunny, with a high near 69. Chance of precipitation is 60%.
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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:
12:26 am CST Feb 27, 2026
Forecast Valid:
12am CST Feb 27, 2026-6pm CST Mar 5, 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