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

71°F

22°C

Humidity 39%
Wind Speed S 10 G 21 mph
Barometer 30.11 in (1019.2 mb)
Dewpoint 45°F (7°C)
Visibility 10.00 mi
Last update 9 Apr 8:53 pm CDT
Extended Forecast for

Cahokia IL

  • Tonight

    Tonight: Increasing clouds, with a low around 60. South wind 8 to 10 mph, with gusts as high as 21 mph.

    Low: 60 °F

    Increasing
    Clouds

  • Friday

    Friday: Showers and thunderstorms likely before 4pm, then showers likely and possibly a thunderstorm between 4pm and 5pm, then a chance of showers and thunderstorms after 5pm. Mostly cloudy, with a high near 73. Southwest wind 7 to 9 mph becoming northwest in the afternoon. Chance of precipitation is 70%.

    High: 73 °F

    Showers
    Likely

  • Friday Night

    Friday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 52. North wind 3 to 6 mph. Chance of precipitation is 40%.

    Low: 52 °F

    Chance
    Showers

  • Saturday

    Saturday: A chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 76. Southeast wind 6 to 8 mph. Chance of precipitation is 40%.

    High: 76 °F

    Chance
    Showers

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 61. Southeast wind around 7 mph.

    Low: 61 °F

    Mostly Cloudy

  • Sunday

    Sunday: A 20 percent chance of showers after 1pm. Mostly cloudy, with a high near 80.

    High: 80 °F

    Partly Sunny
    then Slight
    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 65. Chance of precipitation is 60%.

    Low: 65 °F

    Chance
    Showers then
    Showers
    Likely

  • Monday

    Monday: A chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 85. Chance of precipitation is 30%.

    High: 85 °F

    Chance
    Showers

  • Monday Night

    Monday Night: A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 70.

    Low: 70 °F

    Slight Chance
    T-storms

Detailed Forecast

Tonight
Increasing clouds, with a low around 60. South wind 8 to 10 mph, with gusts as high as 21 mph.
Friday
Showers and thunderstorms likely before 4pm, then showers likely and possibly a thunderstorm between 4pm and 5pm, then a chance of showers and thunderstorms after 5pm. Mostly cloudy, with a high near 73. Southwest wind 7 to 9 mph becoming northwest in the afternoon. Chance of precipitation is 70%.
Friday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 52. North wind 3 to 6 mph. Chance of precipitation is 40%.
Saturday
A chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 76. Southeast wind 6 to 8 mph. Chance of precipitation is 40%.
Saturday Night
Mostly cloudy, with a low around 61. Southeast wind around 7 mph.
Sunday
A 20 percent chance of showers after 1pm. Mostly cloudy, with a high near 80.
Sunday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 65. Chance of precipitation is 60%.
Monday
A chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 85. Chance of precipitation is 30%.
Monday Night
A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 70.
Tuesday
A 40 percent chance of showers and thunderstorms, mainly after 1pm. Partly sunny, with a high near 87.
Tuesday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 66.
Wednesday
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 83.
Wednesday Night
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 59.
Thursday
A 30 percent chance of showers. Mostly 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:
8:26 pm CDT Apr 9, 2026
Forecast Valid:
8pm CDT Apr 9, 2026-6pm CDT Apr 16, 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