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

62°F

17°C

Humidity 50%
Wind Speed SW 7 mph
Barometer 29.97 in (1015.0 mb)
Dewpoint 43°F (6°C)
Visibility 10.00 mi
Last update 27 Feb 10:53 am CST
Extended Forecast for

Cahokia IL

  • This Afternoon

    This Afternoon: Sunny, with a high near 75. Southwest wind 8 to 15 mph, with gusts as high as 24 mph.

    High: 75 °F

    Sunny

  • Tonight

    Tonight: Clear, with a low around 38. Southwest wind 5 to 7 mph becoming light and variable.

    Low: 38 °F

    Clear

  • Saturday

    Saturday: A slight chance of rain between 3pm and 5pm. Mostly sunny, with a high near 68. North wind 5 to 8 mph becoming south in the afternoon. Chance of precipitation is 20%.

    High: 68 °F

    Sunny then
    Slight Chance
    Rain

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 32. South wind 6 to 10 mph becoming north after midnight. Winds could gust as high as 21 mph.

    Low: 32 °F

    Partly Cloudy

  • Sunday

    Sunday: A 20 percent chance of rain after noon. Mostly cloudy, with a high near 47. Northeast wind 8 to 10 mph.

    High: 47 °F

    Partly Sunny
    then Slight
    Chance Rain

  • Sunday Night

    Sunday Night: Rain and snow. Low around 33. Chance of precipitation is 80%. New snow accumulation of less than a half inch possible.

    Low: 33 °F

    Rain/Snow

  • Monday

    Monday: A 40 percent chance of rain, mainly before noon. Cloudy, with a high near 45.

    High: 45 °F

    Chance Rain

  • Monday Night

    Monday Night: A 50 percent chance of rain. Cloudy, with a low around 36.

    Low: 36 °F

    Chance Rain

  • Tuesday

    Tuesday: Rain. High near 54. Chance of precipitation is 80%.

    High: 54 °F

    Rain

Detailed Forecast

This Afternoon
Sunny, with a high near 75. Southwest wind 8 to 15 mph, with gusts as high as 24 mph.
Tonight
Clear, with a low around 38. Southwest wind 5 to 7 mph becoming light and variable.
Saturday
A slight chance of rain between 3pm and 5pm. Mostly sunny, with a high near 68. North wind 5 to 8 mph becoming south in the afternoon. Chance of precipitation is 20%.
Saturday Night
Partly cloudy, with a low around 32. South wind 6 to 10 mph becoming north after midnight. Winds could gust as high as 21 mph.
Sunday
A 20 percent chance of rain after noon. Mostly cloudy, with a high near 47. Northeast wind 8 to 10 mph.
Sunday Night
Rain and snow. Low around 33. Chance of precipitation is 80%. New snow accumulation of less than a half inch possible.
Monday
A 40 percent chance of rain, mainly before noon. Cloudy, with a high near 45.
Monday Night
A 50 percent chance of rain. Cloudy, with a low around 36.
Tuesday
Rain. High near 54. Chance of precipitation is 80%.
Tuesday Night
Rain likely, with thunderstorms also possible after midnight. Cloudy, with a low around 43. Chance of precipitation is 70%.
Wednesday
Rain likely. Cloudy, with a high near 63. Chance of precipitation is 60%.
Wednesday Night
Rain likely and possibly a thunderstorm. Cloudy, with a low around 52. Chance of precipitation is 70%.
Thursday
Rain likely. Partly sunny, with a high near 69. Chance of precipitation is 60%.
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:
12:06 pm CST Feb 27, 2026
Forecast Valid:
12pm CST Feb 27, 2026-6pm CST Mar 5, 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