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.

A Few Clouds

82°F

28°C

Humidity 43%
Wind Speed S 13 G 29 mph
Barometer 29.83 in (1009.8 mb)
Dewpoint 57°F (14°C)
Visibility 10.00 mi
Heat Index82°F (28°C)
Last update 23 Apr 12:53 pm CDT
Extended Forecast for

Cahokia IL

  • This Afternoon

    This Afternoon: Mostly sunny, with a high near 84. South wind around 16 mph, with gusts as high as 26 mph.

    High: 84 °F

    Mostly Sunny

  • Tonight

    Tonight: A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 4am. Low around 64. South wind 9 to 14 mph, with gusts as high as 23 mph. Chance of precipitation is 80%.

    Low: 64 °F

    Partly Cloudy
    then Showers

  • Friday

    Friday: Showers and thunderstorms, mainly before noon. High near 76. South wind around 9 mph becoming west in the afternoon. Chance of precipitation is 90%.

    High: 76 °F

    Showers then
    Chance
    T-storms

  • Friday Night

    Friday Night: Partly cloudy, with a low around 53. North wind 3 to 6 mph.

    Low: 53 °F

    Partly Cloudy

  • Saturday

    Saturday: Sunny, with a high near 77. Northeast wind 3 to 7 mph.

    High: 77 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 55.

    Low: 55 °F

    Mostly Cloudy

  • Sunday

    Sunday: A slight chance of showers, then a chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 76. Chance of precipitation is 30%.

    High: 76 °F

    Chance
    Showers

  • Sunday Night

    Sunday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 62. Chance of precipitation is 70%.

    Low: 62 °F

    Chance
    T-storms then
    Showers
    Likely

  • Monday

    Monday: Showers and possibly a thunderstorm. High near 78. Chance of precipitation is 80%.

    High: 78 °F

    Showers

Detailed Forecast

This Afternoon
Mostly sunny, with a high near 84. South wind around 16 mph, with gusts as high as 26 mph.
Tonight
A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 4am. Low around 64. South wind 9 to 14 mph, with gusts as high as 23 mph. Chance of precipitation is 80%.
Friday
Showers and thunderstorms, mainly before noon. High near 76. South wind around 9 mph becoming west in the afternoon. Chance of precipitation is 90%.
Friday Night
Partly cloudy, with a low around 53. North wind 3 to 6 mph.
Saturday
Sunny, with a high near 77. Northeast wind 3 to 7 mph.
Saturday Night
Mostly cloudy, with a low around 55.
Sunday
A slight chance of showers, then a chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 76. Chance of precipitation is 30%.
Sunday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 62. Chance of precipitation is 70%.
Monday
Showers and possibly a thunderstorm. High near 78. Chance of precipitation is 80%.
Monday Night
A 30 percent chance of showers, mainly before 1am. Partly cloudy, with a low around 53.
Tuesday
Sunny, with a high near 73.
Tuesday Night
Mostly clear, with a low around 51.
Wednesday
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 72.
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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:
10:41 am CDT Apr 23, 2026
Forecast Valid:
1pm CDT Apr 23, 2026-6pm CDT Apr 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