National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

St. Louis Downtown Airport (KCPS)

Lat: 38.56°NLon: 90.15°WElev: 410ft.

Fair

90°F

32°C

Humidity 34%
Wind Speed S 8 mph
Barometer 30.14 in (1020.2 mb)
Dewpoint 58°F (14°C)
Visibility 10.00 mi
Heat Index89°F (32°C)
Last update 3 Oct 3:53 pm CDT
Extended Forecast for

Cahokia IL

  • Tonight

    Tonight: Mostly clear, with a low around 63. South wind 3 to 5 mph.

    Low: 63 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 88. Light south wind increasing to 5 to 10 mph in the morning.

    High: 88 °F

    Sunny

  • Saturday Night

    Saturday Night: Clear, with a low around 58. South wind 3 to 7 mph.

    Low: 58 °F

    Clear

  • Sunday

    Sunday: Sunny, with a high near 88. South wind 6 to 11 mph, with gusts as high as 20 mph.

    High: 88 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 64. South wind 3 to 7 mph.

    Low: 64 °F

    Mostly Clear

  • Monday

    Monday: A slight chance of showers, then a chance of showers and thunderstorms after 10am. Mostly sunny, with a high near 86. Chance of precipitation is 30%.

    High: 86 °F

    Chance
    T-storms

  • Monday Night

    Monday Night: A 40 percent chance of showers and thunderstorms, mainly after 1am. Partly cloudy, with a low around 65.

    Low: 65 °F

    Slight Chance
    T-storms then
    Chance
    Showers

  • Tuesday

    Tuesday: A chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 81. Chance of precipitation is 30%.

    High: 81 °F

    Chance
    Showers

  • Tuesday Night

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

    Low: 58 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Mostly clear, with a low around 63. South wind 3 to 5 mph.
Saturday
Sunny, with a high near 88. Light south wind increasing to 5 to 10 mph in the morning.
Saturday Night
Clear, with a low around 58. South wind 3 to 7 mph.
Sunday
Sunny, with a high near 88. South wind 6 to 11 mph, with gusts as high as 20 mph.
Sunday Night
Mostly clear, with a low around 64. South wind 3 to 7 mph.
Monday
A slight chance of showers, then a chance of showers and thunderstorms after 10am. Mostly sunny, with a high near 86. Chance of precipitation is 30%.
Monday Night
A 40 percent chance of showers and thunderstorms, mainly after 1am. Partly cloudy, with a low around 65.
Tuesday
A chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 81. Chance of precipitation is 30%.
Tuesday Night
Mostly cloudy, with a low around 58.
Wednesday
Mostly sunny, with a high near 77.
Wednesday Night
Mostly clear, with a low around 53.
Thursday
Sunny, with a high near 77.
Thursday Night
Mostly clear, with a low around 51.
Friday
Sunny, with a high near 81.
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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:
2:36 pm CDT Oct 3, 2025
Forecast Valid:
4pm CDT Oct 3, 2025-6pm CDT Oct 10, 2025
 
Forecast Discussion
 
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Additional Resources

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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