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.

Mostly Cloudy

43°F

6°C

Humidity 63%
Wind Speed NE 15 G 20 mph
Barometer 30.40 in (1029.3 mb)
Dewpoint 31°F (-1°C)
Visibility 10.00 mi
Wind Chill36°F (2°C)
Last update 7 Apr 6:53 am CDT
Extended Forecast for

Cahokia IL

  • Today

    Today: Cloudy, then gradually becoming mostly sunny, with a high near 57. East wind 9 to 13 mph, with gusts as high as 21 mph.

    High: 57 °F

    Decreasing
    Clouds

  • Tonight

    Tonight: Partly cloudy, with a low around 41. East wind 6 to 8 mph.

    Low: 41 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 75. South wind 7 to 14 mph, with gusts as high as 23 mph.

    High: 75 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 54. South wind 8 to 10 mph.

    Low: 54 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 78. South wind 7 to 10 mph.

    High: 78 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 58.

    Low: 58 °F

    Mostly Cloudy

  • Friday

    Friday: A chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 75. Chance of precipitation is 50%.

    High: 75 °F

    Chance
    Showers

  • Friday Night

    Friday Night: A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 56.

    Low: 56 °F

    Chance
    T-storms

  • Saturday

    Saturday: A chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 78. Chance of precipitation is 30%.

    High: 78 °F

    Chance
    Showers

Detailed Forecast

Today
Cloudy, then gradually becoming mostly sunny, with a high near 57. East wind 9 to 13 mph, with gusts as high as 21 mph.
Tonight
Partly cloudy, with a low around 41. East wind 6 to 8 mph.
Wednesday
Mostly sunny, with a high near 75. South wind 7 to 14 mph, with gusts as high as 23 mph.
Wednesday Night
Mostly clear, with a low around 54. South wind 8 to 10 mph.
Thursday
Sunny, with a high near 78. South wind 7 to 10 mph.
Thursday Night
Mostly cloudy, with a low around 58.
Friday
A chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 75. Chance of precipitation is 50%.
Friday Night
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 56.
Saturday
A chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 78. Chance of precipitation is 30%.
Saturday Night
Partly cloudy, with a low around 61.
Sunday
A 20 percent chance of showers and thunderstorms. Partly sunny, with a high near 83.
Sunday Night
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 66.
Monday
A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 84.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Cahokia IL
 38.57°N 90.18°W (Elev. 407 ft)
Last Update:
5:21 am CDT Apr 7, 2026
Forecast Valid:
6am CDT Apr 7, 2026-6pm CDT Apr 13, 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