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

56°F

13°C

Humidity 100%
Wind Speed Calm
Barometer 30.00 in (1015.6 mb)
Dewpoint 56°F (13°C)
Visibility 9.00 mi
Last update 8 Oct 1:53 am CDT
Extended Forecast for

Cahokia IL

  • Overnight

    Overnight: Clear, with a low around 59. Calm wind.

    Low: 59 °F

    Clear

  • Thursday

    Thursday: Patchy fog before 8am. Otherwise, sunny, with a high near 87. Light and variable wind.

    High: 87 °F

    Patchy Fog
    then Sunny

  • Thursday Night

    Thursday Night: Clear, with a low around 59. Light and variable wind.

    Low: 59 °F

    Clear

  • Friday

    Friday: Sunny, with a high near 91. South wind 3 to 8 mph.

    High: 91 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 62. South wind 3 to 7 mph.

    Low: 62 °F

    Mostly Clear

  • Saturday

    Saturday: Mostly sunny, with a high near 86.

    High: 86 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Showers likely. Mostly cloudy, with a low around 61. Chance of precipitation is 60%.

    Low: 61 °F

    Showers
    Likely

  • Sunday

    Sunday: A 20 percent chance of showers before 1pm. Partly sunny, with a high near 79.

    High: 79 °F

    Slight Chance
    Showers

  • Sunday Night

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

    Low: 61 °F

    Mostly Clear

Detailed Forecast

Overnight
Clear, with a low around 59. Calm wind.
Thursday
Patchy fog before 8am. Otherwise, sunny, with a high near 87. Light and variable wind.
Thursday Night
Clear, with a low around 59. Light and variable wind.
Friday
Sunny, with a high near 91. South wind 3 to 8 mph.
Friday Night
Mostly clear, with a low around 62. South wind 3 to 7 mph.
Saturday
Mostly sunny, with a high near 86.
Saturday Night
Showers likely. Mostly cloudy, with a low around 61. Chance of precipitation is 60%.
Sunday
A 20 percent chance of showers before 1pm. Partly sunny, with a high near 79.
Sunday Night
Mostly clear, with a low around 61.
Columbus Day
Sunny, with a high near 91.
Monday Night
Mostly clear, with a low around 64.
Tuesday
A 20 percent chance of showers. Sunny, with a high near 81.
Tuesday Night
A 20 percent chance of showers. Partly cloudy, with a low around 55.
Wednesday
Sunny, with a high near 77.
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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:
1:26 am CDT Oct 8, 2026
Forecast Valid:
2am CDT Oct 8, 2026-6pm CDT Oct 14, 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