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

38°F

3°C

Humidity 68%
Wind Speed Calm
Barometer 29.76 in (1007.9 mb)
Dewpoint 28°F (-2°C)
Visibility 10.00 mi
Last update 25 Feb 7:53 am CST
Extended Forecast for

Cahokia IL

  • Today

    Today: Cloudy, with a high near 53. Light and variable wind.

    High: 53 °F

    Cloudy

  • Tonight

    Tonight: A 50 percent chance of rain, mainly between 9pm and 5am. Mostly cloudy, with a low around 36. Light northeast wind.

    Low: 36 °F

    Chance Rain

  • Thursday

    Thursday: Mostly sunny, with a high near 55. Light and variable wind becoming east around 6 mph.

    High: 55 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 35. Calm wind.

    Low: 35 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 69. Light south wind becoming southwest 5 to 10 mph in the morning.

    High: 69 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 43.

    Low: 43 °F

    Mostly Clear

  • Saturday

    Saturday: Mostly sunny, with a high near 64.

    High: 64 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: A 20 percent chance of rain. Partly cloudy, with a low around 33.

    Low: 33 °F

    Slight Chance
    Rain

  • Sunday

    Sunday: A chance of rain before noon, then a chance of rain and snow. Mostly cloudy, with a high near 47. Chance of precipitation is 40%.

    High: 47 °F

    Chance Rain
    then Chance
    Rain/Snow

Detailed Forecast

Today
Cloudy, with a high near 53. Light and variable wind.
Tonight
A 50 percent chance of rain, mainly between 9pm and 5am. Mostly cloudy, with a low around 36. Light northeast wind.
Thursday
Mostly sunny, with a high near 55. Light and variable wind becoming east around 6 mph.
Thursday Night
Mostly clear, with a low around 35. Calm wind.
Friday
Sunny, with a high near 69. Light south wind becoming southwest 5 to 10 mph in the morning.
Friday Night
Mostly clear, with a low around 43.
Saturday
Mostly sunny, with a high near 64.
Saturday Night
A 20 percent chance of rain. Partly cloudy, with a low around 33.
Sunday
A chance of rain before noon, then a chance of rain and snow. Mostly cloudy, with a high near 47. Chance of precipitation is 40%.
Sunday Night
Rain likely before midnight, then a chance of rain and snow. Some thunder is also possible. Mostly cloudy, with a low around 33. Chance of precipitation is 60%.
Monday
A 40 percent chance of rain. Mostly cloudy, with a high near 44.
Monday Night
A 40 percent chance of rain and thunderstorms. Mostly cloudy, with a low around 31.
Tuesday
A 50 percent chance of rain. Mostly cloudy, with a high near 49.
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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:
5:26 am CST Feb 25, 2026
Forecast Valid:
8am CST Feb 25, 2026-6pm CST Mar 3, 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