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.

Fair

38°F

3°C

Humidity 97%
Wind Speed Calm
Barometer 30.09 in (1019.0 mb)
Dewpoint 37°F (3°C)
Visibility 10.00 mi
Last update 10 Jan 2:53 am CST
Extended Forecast for

Cahokia IL

  • Overnight

    Overnight: A 20 percent chance of rain after 5am. Mostly cloudy, with a low around 38. Light north wind.

    Low: 38 °F

    Slight Chance
    Rain

  • Saturday

    Saturday: A 30 percent chance of rain, mainly before 9am. Cloudy through mid morning, then gradual clearing, with a high near 48. Light northwest wind increasing to 10 to 15 mph in the morning. Winds could gust as high as 24 mph.

    High: 48 °F

    Chance Rain
    then Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy during the early evening, then gradual clearing, with a low around 26. Northwest wind 8 to 14 mph, with gusts as high as 26 mph.

    Low: 26 °F

    Gradual
    Clearing

  • Sunday

    Sunday: Sunny, with a high near 40. Northwest wind 8 to 13 mph becoming light west in the afternoon. Winds could gust as high as 24 mph.

    High: 40 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 27. Calm wind becoming southwest around 6 mph after midnight.

    Low: 27 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 53.

    High: 53 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 37.

    Low: 37 °F

    Mostly Clear

  • Tuesday

    Tuesday: Partly sunny, with a high near 61.

    High: 61 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 39.

    Low: 39 °F

    Mostly Cloudy

Detailed Forecast

Overnight
A 20 percent chance of rain after 5am. Mostly cloudy, with a low around 38. Light north wind.
Saturday
A 30 percent chance of rain, mainly before 9am. Cloudy through mid morning, then gradual clearing, with a high near 48. Light northwest wind increasing to 10 to 15 mph in the morning. Winds could gust as high as 24 mph.
Saturday Night
Mostly cloudy during the early evening, then gradual clearing, with a low around 26. Northwest wind 8 to 14 mph, with gusts as high as 26 mph.
Sunday
Sunny, with a high near 40. Northwest wind 8 to 13 mph becoming light west in the afternoon. Winds could gust as high as 24 mph.
Sunday Night
Mostly clear, with a low around 27. Calm wind becoming southwest around 6 mph after midnight.
Monday
Sunny, with a high near 53.
Monday Night
Mostly clear, with a low around 37.
Tuesday
Partly sunny, with a high near 61.
Tuesday Night
Mostly cloudy, with a low around 39.
Wednesday
Mostly cloudy, with a high near 46.
Wednesday Night
Mostly cloudy, with a low around 22.
Thursday
Mostly sunny, with a high near 39.
Thursday Night
Mostly cloudy, with a low around 29.
Friday
Partly sunny, with a high near 46.
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:
3:16 am CST Jan 10, 2026
Forecast Valid:
3am CST Jan 10, 2026-6pm CST Jan 16, 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