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.

A Few Clouds

72°F

22°C

Humidity 71%
Wind Speed E 5 mph
Barometer 30.09 in (1018.4 mb)
Dewpoint 62°F (17°C)
Visibility 10.00 mi
Last update 22 Jul 9:53 pm CDT
Extended Forecast for

Cahokia IL

  • Tonight

    Tonight: Mostly cloudy, with a low around 63. Northeast wind 3 to 6 mph.

    Low: 63 °F

    Mostly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 83. East wind 3 to 6 mph.

    High: 83 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 65. East wind around 6 mph becoming calm in the evening.

    Low: 65 °F

    Mostly Cloudy

  • Friday

    Friday: A 40 percent chance of showers, mainly after 7am. Mostly cloudy, with a high near 81. Calm wind becoming southeast around 5 mph in the afternoon.

    High: 81 °F

    Chance
    Showers

  • Friday Night

    Friday Night: A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 67. Southeast wind 3 to 6 mph.

    Low: 67 °F

    Chance
    Showers then
    Chance
    T-storms

  • Saturday

    Saturday: A 50 percent chance of showers and thunderstorms, mainly before 10am. Partly sunny, with a high near 89.

    High: 89 °F

    Chance
    T-storms then
    Slight Chance
    T-storms

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 73.

    Low: 73 °F

    Mostly Clear

  • Sunday

    Sunday: Mostly sunny, with a high near 96.

    High: 96 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 76.

    Low: 76 °F

    Mostly Clear

Detailed Forecast

Tonight
Mostly cloudy, with a low around 63. Northeast wind 3 to 6 mph.
Thursday
Mostly sunny, with a high near 83. East wind 3 to 6 mph.
Thursday Night
Mostly cloudy, with a low around 65. East wind around 6 mph becoming calm in the evening.
Friday
A 40 percent chance of showers, mainly after 7am. Mostly cloudy, with a high near 81. Calm wind becoming southeast around 5 mph in the afternoon.
Friday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 67. Southeast wind 3 to 6 mph.
Saturday
A 50 percent chance of showers and thunderstorms, mainly before 10am. Partly sunny, with a high near 89.
Saturday Night
Mostly clear, with a low around 73.
Sunday
Mostly sunny, with a high near 96.
Sunday Night
Mostly clear, with a low around 76.
Monday
Sunny and hot, with a high near 98.
Monday Night
Mostly clear, with a low around 76.
Tuesday
Mostly sunny, with a high near 96.
Tuesday Night
A 20 percent chance of showers. Partly cloudy, with a low around 74.
Wednesday
A 20 percent chance of showers. Mostly sunny, with a high near 92.
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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:
9:36 pm CDT Jul 22, 2026
Forecast Valid:
10pm CDT Jul 22, 2026-6pm CDT Jul 29, 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