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

60°F

16°C

Humidity 41%
Wind Speed N 9 mph
Barometer 29.98 in (1015.3 mb)
Dewpoint 36°F (2°C)
Visibility 10.00 mi
Last update 6 May 5:53 pm CDT
Extended Forecast for

Cahokia IL

  • Tonight

    Tonight: Increasing clouds, with a low around 43. North wind 5 to 8 mph becoming calm after midnight.

    Low: 43 °F

    Increasing
    Clouds

  • Thursday

    Thursday: Sunny, with a high near 68. Light southwest wind increasing to 6 to 11 mph in the morning.

    High: 68 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 50. South wind 5 to 8 mph.

    Low: 50 °F

    Mostly Clear

  • Friday

    Friday: A chance of showers between 1pm and 4pm, then a chance of showers and thunderstorms after 4pm. Partly sunny, with a high near 77. Southwest wind 5 to 9 mph. Chance of precipitation is 30%.

    High: 77 °F

    Mostly Sunny
    then Chance
    T-storms

  • Friday Night

    Friday Night: Showers and possibly a thunderstorm before 1am. Low around 53. West wind around 6 mph becoming calm in the evening. Chance of precipitation is 80%.

    Low: 53 °F

    Showers

  • Saturday

    Saturday: Sunny, with a high near 81.

    High: 81 °F

    Sunny

  • Saturday Night

    Saturday Night: A slight chance of showers, then showers likely and possibly a thunderstorm after 1am. Partly cloudy, with a low around 59. Chance of precipitation is 60%.

    Low: 59 °F

    Slight Chance
    Showers then
    Showers
    Likely

  • Sunday

    Sunday: A 40 percent chance of showers and thunderstorms before 1pm. Partly sunny, with a high near 74.

    High: 74 °F

    Chance
    T-storms

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 49.

    Low: 49 °F

    Mostly Clear

Detailed Forecast

Tonight
Increasing clouds, with a low around 43. North wind 5 to 8 mph becoming calm after midnight.
Thursday
Sunny, with a high near 68. Light southwest wind increasing to 6 to 11 mph in the morning.
Thursday Night
Mostly clear, with a low around 50. South wind 5 to 8 mph.
Friday
A chance of showers between 1pm and 4pm, then a chance of showers and thunderstorms after 4pm. Partly sunny, with a high near 77. Southwest wind 5 to 9 mph. Chance of precipitation is 30%.
Friday Night
Showers and possibly a thunderstorm before 1am. Low around 53. West wind around 6 mph becoming calm in the evening. Chance of precipitation is 80%.
Saturday
Sunny, with a high near 81.
Saturday Night
A slight chance of showers, then showers likely and possibly a thunderstorm after 1am. Partly cloudy, with a low around 59. Chance of precipitation is 60%.
Sunday
A 40 percent chance of showers and thunderstorms before 1pm. Partly sunny, with a high near 74.
Sunday Night
Mostly clear, with a low around 49.
Monday
Sunny, with a high near 74.
Monday Night
A 20 percent chance of showers. Mostly clear, with a low around 54.
Tuesday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 82.
Tuesday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 59.
Wednesday
Mostly sunny, with a high near 83.
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:
5:21 pm CDT May 6, 2026
Forecast Valid:
6pm CDT May 6, 2026-6pm CDT May 13, 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