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

86°F

30°C

Humidity 39%
Wind Speed Calm
Barometer 30.07 in (1018.0 mb)
Dewpoint 58°F (14°C)
Visibility 10.00 mi
Heat Index85°F (29°C)
Last update 29 Aug 3:53 pm CDT
Extended Forecast for

Cahokia IL

  • Tonight

    Tonight: Mostly clear, with a low around 60. Northeast wind around 5 mph becoming calm in the evening.

    Low: 60 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 86. Calm wind becoming east 5 to 7 mph in the morning.

    High: 86 °F

    Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 62. East wind around 6 mph becoming calm after midnight.

    Low: 62 °F

    Partly Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 84. Calm wind becoming east 5 to 8 mph in the morning.

    High: 84 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 60. East wind around 6 mph becoming calm after midnight.

    Low: 60 °F

    Mostly Cloudy

  • Labor Day

    Labor Day: Partly sunny, with a high near 80.

    High: 80 °F

    Partly Sunny

  • Monday Night

    Monday Night: A 20 percent chance of showers after 1am. Mostly cloudy, with a low around 60.

    Low: 60 °F

    Mostly Cloudy
    then Slight
    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: A slight chance of showers and thunderstorms. Partly cloudy, with a low around 60. Chance of precipitation is 20%.

    Low: 60 °F

    Slight Chance
    T-storms

Detailed Forecast

Tonight
Mostly clear, with a low around 60. Northeast wind around 5 mph becoming calm in the evening.
Saturday
Sunny, with a high near 86. Calm wind becoming east 5 to 7 mph in the morning.
Saturday Night
Partly cloudy, with a low around 62. East wind around 6 mph becoming calm after midnight.
Sunday
Partly sunny, with a high near 84. Calm wind becoming east 5 to 8 mph in the morning.
Sunday Night
Mostly cloudy, with a low around 60. East wind around 6 mph becoming calm after midnight.
Labor Day
Partly sunny, with a high near 80.
Monday Night
A 20 percent chance of showers after 1am. Mostly cloudy, with a low around 60.
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
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 60. Chance of precipitation is 20%.
Wednesday
A 30 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 81.
Wednesday Night
A 20 percent chance of showers. Partly cloudy, with a low around 55.
Thursday
Mostly sunny, with a high near 73.
Thursday Night
Mostly clear, with a low around 50.
Friday
Sunny, with a high near 79.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Cahokia IL
 38.55°N 90.18°W (Elev. 407 ft)
Last Update:
2:06 pm CDT Aug 29, 2025
Forecast Valid:
4pm CDT Aug 29, 2025-6pm CDT Sep 5, 2025
 
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