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

19°F

-7°C

Humidity 59%
Wind Speed N 17 G 22 mph
Barometer 30.13 in (1020.7 mb)
Dewpoint 7°F (-14°C)
Visibility 10.00 mi
Wind Chill4°F (-16°C)
Last update 15 Jan 5:53 am CST
Extended Forecast for

Cahokia IL

  • Today

    Today: Sunny, with a high near 36. Northwest wind 6 to 9 mph becoming south in the afternoon.

    High: 36 °F

    Sunny

  • Tonight

    Tonight: A 40 percent chance of snow, mainly before 11pm. Cloudy, then gradually becoming partly cloudy, with a low around 29. South wind 6 to 9 mph becoming west after midnight.

    Low: 29 °F

    Chance Snow
    then Mostly
    Cloudy

  • Friday

    Friday: Mostly cloudy, with a high near 46. West wind 9 to 14 mph, with gusts as high as 23 mph.

    High: 46 °F

    Mostly Cloudy

  • Friday Night

    Friday Night: Scattered snow showers. Mostly cloudy, with a low around 22. West wind 8 to 11 mph, with gusts as high as 21 mph. Chance of precipitation is 50%.

    Low: 22 °F

    Scattered
    Snow Showers

  • Saturday

    Saturday: Partly sunny, with a high near 27. West wind 10 to 14 mph, with gusts as high as 23 mph.

    High: 27 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 11.

    Low: 11 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 29.

    High: 29 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 15.

    Low: 15 °F

    Partly Cloudy

  • M.L.King Day

    M.L.King Day: Mostly sunny, with a high near 27.

    High: 27 °F

    Mostly Sunny

Detailed Forecast

Today
Sunny, with a high near 36. Northwest wind 6 to 9 mph becoming south in the afternoon.
Tonight
A 40 percent chance of snow, mainly before 11pm. Cloudy, then gradually becoming partly cloudy, with a low around 29. South wind 6 to 9 mph becoming west after midnight.
Friday
Mostly cloudy, with a high near 46. West wind 9 to 14 mph, with gusts as high as 23 mph.
Friday Night
Scattered snow showers. Mostly cloudy, with a low around 22. West wind 8 to 11 mph, with gusts as high as 21 mph. Chance of precipitation is 50%.
Saturday
Partly sunny, with a high near 27. West wind 10 to 14 mph, with gusts as high as 23 mph.
Saturday Night
Partly cloudy, with a low around 11.
Sunday
Mostly sunny, with a high near 29.
Sunday Night
Partly cloudy, with a low around 15.
M.L.King Day
Mostly sunny, with a high near 27.
Monday Night
Mostly clear, with a low around 11.
Tuesday
Sunny, with a high near 32.
Tuesday Night
Mostly clear, with a low around 21.
Wednesday
Mostly 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:
4:26 am CST Jan 15, 2026
Forecast Valid:
6am CST Jan 15, 2026-6pm CST Jan 21, 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