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.

Overcast

74°F

23°C

Humidity 52%
Wind Speed SW 15 G 29 mph
Barometer 29.89 in (1012.0 mb)
Dewpoint 55°F (13°C)
Visibility 10.00 mi
Last update 12 Apr 8:53 pm CDT
Extended Forecast for

Cahokia IL

  • Tonight

    Tonight: A 40 percent chance of showers, mainly before 11pm. Mostly cloudy, with a low around 67. Southwest wind 9 to 15 mph, with gusts as high as 28 mph.

    Low: 67 °F

    Chance
    Showers

  • Monday

    Monday: Partly sunny, with a high near 86. South wind 8 to 15 mph, with gusts as high as 25 mph.

    High: 86 °F

    Partly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 70. South wind 10 to 14 mph, with gusts as high as 23 mph.

    Low: 70 °F

    Partly Cloudy

  • Tuesday

    Tuesday: A 20 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 89. South wind 9 to 15 mph, with gusts as high as 25 mph.

    High: 89 °F

    Partly Sunny
    then Slight
    Chance
    T-storms

  • Tuesday Night

    Tuesday Night: A 40 percent chance of showers and thunderstorms, mainly after 1am. Mostly cloudy, with a low around 70. South wind 9 to 14 mph, with gusts as high as 22 mph.

    Low: 70 °F

    Chance
    T-storms

  • Wednesday

    Wednesday: Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 82. Chance of precipitation is 70%.

    High: 82 °F

    Showers
    Likely

  • Wednesday Night

    Wednesday Night: Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 64. Chance of precipitation is 60%.

    Low: 64 °F

    Showers
    Likely

  • Thursday

    Thursday: A 20 percent chance of showers before 1pm. Mostly sunny, with a high near 86.

    High: 86 °F

    Slight Chance
    Showers

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 63.

    Low: 63 °F

    Mostly Clear

Detailed Forecast

Tonight
A 40 percent chance of showers, mainly before 11pm. Mostly cloudy, with a low around 67. Southwest wind 9 to 15 mph, with gusts as high as 28 mph.
Monday
Partly sunny, with a high near 86. South wind 8 to 15 mph, with gusts as high as 25 mph.
Monday Night
Partly cloudy, with a low around 70. South wind 10 to 14 mph, with gusts as high as 23 mph.
Tuesday
A 20 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 89. South wind 9 to 15 mph, with gusts as high as 25 mph.
Tuesday Night
A 40 percent chance of showers and thunderstorms, mainly after 1am. Mostly cloudy, with a low around 70. South wind 9 to 14 mph, with gusts as high as 22 mph.
Wednesday
Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 82. Chance of precipitation is 70%.
Wednesday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 64. Chance of precipitation is 60%.
Thursday
A 20 percent chance of showers before 1pm. Mostly sunny, with a high near 86.
Thursday Night
Mostly clear, with a low around 63.
Friday
A 30 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 90.
Friday Night
Showers and thunderstorms likely. Mostly cloudy, with a low around 65. Chance of precipitation is 60%.
Saturday
Showers and thunderstorms likely. Partly sunny, with a high near 80. Chance of precipitation is 60%.
Saturday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 46.
Sunday
Mostly sunny, with a high near 65.
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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:
6:35 pm CDT Apr 12, 2026
Forecast Valid:
9pm CDT Apr 12, 2026-6pm CDT Apr 19, 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