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

70°F

21°C

Humidity 64%
Wind Speed S 6 mph
Barometer 29.67 in (1004.2 mb)
Dewpoint 57°F (14°C)
Visibility 10.00 mi
Last update 22 Mar 7:53 am CDT
Extended Forecast for

Cahokia IL

  • Today

    Today: Mostly sunny, with a high near 93. Southwest wind 6 to 14 mph becoming northwest in the afternoon. Winds could gust as high as 21 mph.

    High: 93 °F

    Mostly Sunny

  • Tonight

    Tonight: A 20 percent chance of showers and thunderstorms before 10pm. Mostly cloudy, then gradually becoming mostly clear, with a low around 38. Breezy, with a north wind 17 to 22 mph decreasing to 11 to 16 mph after midnight. Winds could gust as high as 37 mph.

    Low: 38 °F

    Slight Chance
    T-storms and
    Breezy then
    Mostly Clear

  • Monday

    Monday: Mostly sunny, with a high near 57. North wind around 9 mph.

    High: 57 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 40. Northeast wind 3 to 5 mph.

    Low: 40 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 66. Southeast wind 3 to 6 mph.

    High: 66 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 47.

    Low: 47 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 77.

    High: 77 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 61.

    Low: 61 °F

    Slight Chance
    T-storms

  • Thursday

    Thursday: A 20 percent chance of showers and thunderstorms after 1pm. Sunny, with a high near 90.

    High: 90 °F

    Sunny then
    Slight Chance
    T-storms

Detailed Forecast

Today
Mostly sunny, with a high near 93. Southwest wind 6 to 14 mph becoming northwest in the afternoon. Winds could gust as high as 21 mph.
Tonight
A 20 percent chance of showers and thunderstorms before 10pm. Mostly cloudy, then gradually becoming mostly clear, with a low around 38. Breezy, with a north wind 17 to 22 mph decreasing to 11 to 16 mph after midnight. Winds could gust as high as 37 mph.
Monday
Mostly sunny, with a high near 57. North wind around 9 mph.
Monday Night
Mostly cloudy, with a low around 40. Northeast wind 3 to 5 mph.
Tuesday
Mostly sunny, with a high near 66. Southeast wind 3 to 6 mph.
Tuesday Night
Mostly cloudy, with a low around 47.
Wednesday
Partly sunny, with a high near 77.
Wednesday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 61.
Thursday
A 20 percent chance of showers and thunderstorms after 1pm. Sunny, with a high near 90.
Thursday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 43.
Friday
A 50 percent chance of showers. Mostly cloudy, with a high near 55.
Friday Night
A 20 percent chance of showers. Partly cloudy, with a low around 34.
Saturday
Mostly sunny, with a high near 58.
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:
8:26 am CDT Mar 22, 2026
Forecast Valid:
8am CDT Mar 22, 2026-6pm CDT Mar 28, 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