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

62°F

17°C

Humidity 93%
Wind Speed S 7 mph
Barometer 29.91 in (1012.6 mb)
Dewpoint 60°F (16°C)
Visibility 10.00 mi
Last update 17 Apr 2:53 am CDT
Extended Forecast for

Cahokia IL

  • Overnight

    Overnight: Partly cloudy, with a low around 60. Light south wind.

    Low: 60 °F

    Partly Cloudy

  • Friday

    Friday: A 30 percent chance of showers and thunderstorms, mainly after 3pm. Mostly sunny, with a high near 87. South wind 5 to 15 mph, with gusts as high as 25 mph.

    High: 87 °F

    Mostly Sunny
    then Chance
    T-storms

  • Friday Night

    Friday Night: Showers and thunderstorms likely, then showers and possibly a thunderstorm after 1am. Some of the storms could produce heavy rainfall. Low around 50. South wind 9 to 13 mph becoming northwest after midnight. Winds could gust as high as 23 mph. Chance of precipitation is 100%.

    Low: 50 °F

    Chance
    T-storms then
    Heavy Rain

  • Saturday

    Saturday: A chance of showers and thunderstorms. Cloudy through mid morning, then gradual clearing, with a high near 60. Northwest wind around 14 mph, with gusts as high as 25 mph. Chance of precipitation is 50%.

    High: 60 °F

    Chance
    Showers

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 41. Northwest wind 6 to 11 mph becoming light west after midnight. Winds could gust as high as 20 mph.

    Low: 41 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 68.

    High: 68 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 44.

    Low: 44 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 73.

    High: 73 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 52.

    Low: 52 °F

    Mostly Clear

Detailed Forecast

Overnight
Partly cloudy, with a low around 60. Light south wind.
Friday
A 30 percent chance of showers and thunderstorms, mainly after 3pm. Mostly sunny, with a high near 87. South wind 5 to 15 mph, with gusts as high as 25 mph.
Friday Night
Showers and thunderstorms likely, then showers and possibly a thunderstorm after 1am. Some of the storms could produce heavy rainfall. Low around 50. South wind 9 to 13 mph becoming northwest after midnight. Winds could gust as high as 23 mph. Chance of precipitation is 100%.
Saturday
A chance of showers and thunderstorms. Cloudy through mid morning, then gradual clearing, with a high near 60. Northwest wind around 14 mph, with gusts as high as 25 mph. Chance of precipitation is 50%.
Saturday Night
Mostly clear, with a low around 41. Northwest wind 6 to 11 mph becoming light west after midnight. Winds could gust as high as 20 mph.
Sunday
Sunny, with a high near 68.
Sunday Night
Mostly clear, with a low around 44.
Monday
Sunny, with a high near 73.
Monday Night
Mostly clear, with a low around 52.
Tuesday
Mostly sunny, with a high near 80.
Tuesday Night
Mostly clear, with a low around 57.
Wednesday
Sunny, with a high near 82.
Wednesday Night
Mostly clear, with a low around 60.
Thursday
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 84.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Cahokia IL
 38.57°N 90.18°W (Elev. 407 ft)
Last Update:
2:36 am CDT Apr 17, 2026
Forecast Valid:
3am CDT Apr 17, 2026-6pm CDT Apr 23, 2026
 
Forecast Discussion
 
Get as KML Get as XML

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