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.

Mostly Cloudy

35°F

2°C

Humidity 57%
Wind Speed SE 7 mph
Barometer 30.36 in (1028.7 mb)
Dewpoint 21°F (-6°C)
Visibility 10.00 mi
Wind Chill29°F (-2°C)
Last update 28 Nov 6:53 pm CST
Extended Forecast for

Cahokia IL

Winter Weather Advisory November 29, 12:00am until November 30, 12:00am
Click here for hazard details and duration
Winter Weather Advisory

  • Tonight

    Tonight: Snow, mainly after 3am. Low around 31. Southeast wind 6 to 10 mph, with gusts as high as 25 mph. Chance of precipitation is 100%. Total nighttime snow accumulation of less than one inch possible.

    Low: 31 °F

    Slight Chance
    Snow then
    Snow

  • Saturday

    Saturday: Snow before 10am, then rain and snow, possibly mixed with sleet between 10am and 11am, then rain after 11am. High near 39. Southeast wind 13 to 18 mph, with gusts as high as 33 mph. Chance of precipitation is 100%. New snow and sleet accumulation of 1 to 2 inches possible.

    High: 39 °F

    Wintry Mix
    then Rain

  • Saturday Night

    Saturday Night: Rain and snow likely before 11pm, then a slight chance of snow between 11pm and midnight. Cloudy, with a low around 25. South wind 14 to 18 mph becoming west after midnight. Winds could gust as high as 33 mph. Chance of precipitation is 60%. Little or no snow accumulation expected.

    Low: 25 °F

    Rain/Snow
    Likely then
    Cloudy

  • Sunday

    Sunday: Mostly cloudy, with a high near 31. Northwest wind 9 to 15 mph, with gusts as high as 25 mph.

    High: 31 °F

    Mostly Cloudy

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 20. Northwest wind 5 to 8 mph becoming calm after midnight.

    Low: 20 °F

    Mostly Cloudy

  • Monday

    Monday: A 30 percent chance of snow after noon. Cloudy, with a high near 30.

    High: 30 °F

    Cloudy then
    Chance Snow

  • Monday Night

    Monday Night: A 50 percent chance of snow, mainly before midnight. Cloudy, with a low around 21.

    Low: 21 °F

    Chance Snow
    then Slight
    Chance Snow

  • Tuesday

    Tuesday: Partly sunny, with a high near 32.

    High: 32 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 19.

    Low: 19 °F

    Partly Cloudy

Detailed Forecast

Tonight
Snow, mainly after 3am. Low around 31. Southeast wind 6 to 10 mph, with gusts as high as 25 mph. Chance of precipitation is 100%. Total nighttime snow accumulation of less than one inch possible.
Saturday
Snow before 10am, then rain and snow, possibly mixed with sleet between 10am and 11am, then rain after 11am. High near 39. Southeast wind 13 to 18 mph, with gusts as high as 33 mph. Chance of precipitation is 100%. New snow and sleet accumulation of 1 to 2 inches possible.
Saturday Night
Rain and snow likely before 11pm, then a slight chance of snow between 11pm and midnight. Cloudy, with a low around 25. South wind 14 to 18 mph becoming west after midnight. Winds could gust as high as 33 mph. Chance of precipitation is 60%. Little or no snow accumulation expected.
Sunday
Mostly cloudy, with a high near 31. Northwest wind 9 to 15 mph, with gusts as high as 25 mph.
Sunday Night
Mostly cloudy, with a low around 20. Northwest wind 5 to 8 mph becoming calm after midnight.
Monday
A 30 percent chance of snow after noon. Cloudy, with a high near 30.
Monday Night
A 50 percent chance of snow, mainly before midnight. Cloudy, with a low around 21.
Tuesday
Partly sunny, with a high near 32.
Tuesday Night
Partly cloudy, with a low around 19.
Wednesday
Mostly sunny, with a high near 41.
Wednesday Night
Mostly cloudy, with a low around 21.
Thursday
Partly sunny, with a high near 32.
Thursday Night
Mostly cloudy, with a low around 21.
Friday
Partly sunny, with a high near 40.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Cahokia IL
 38.55°N 90.15°W (Elev. 407 ft)
Last Update:
4:46 pm CST Nov 28, 2025
Forecast Valid:
7pm CST Nov 28, 2025-6pm CST Dec 5, 2025
 
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