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.

Overcast

33°F

1°C

Humidity 48%
Wind Speed S 7 mph
Barometer 29.73 in (1007.0 mb)
Dewpoint 15°F (-9°C)
Visibility 10.00 mi
Wind Chill27°F (-3°C)
Last update 16 Jan 12:53 am CST
Extended Forecast for

Cahokia IL

  • Overnight

    Overnight: Mostly cloudy, with a low around 26. South wind around 8 mph.

    Low: 26 °F

    Mostly Cloudy

  • Friday

    Friday: A chance of sprinkles between 3pm and 4pm, then a slight chance of rain after 4pm. Increasing clouds, with a high near 45. West wind 8 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 20%.

    High: 45 °F

    Partly Sunny
    then Slight
    Chance Rain

  • Friday Night

    Friday Night: A 40 percent chance of snow, mainly before midnight. Mostly cloudy, with a low around 22. West wind 10 to 14 mph, with gusts as high as 23 mph.

    Low: 22 °F

    Chance Snow

  • Saturday

    Saturday: Partly sunny, with a high near 28. West wind 10 to 14 mph, with gusts as high as 22 mph.

    High: 28 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 12. Northwest wind 6 to 9 mph.

    Low: 12 °F

    Mostly Clear

  • Sunday

    Sunday: Mostly sunny, with a high near 31.

    High: 31 °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: Sunny, with a high near 25.

    High: 25 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 11.

    Low: 11 °F

    Mostly Clear

Detailed Forecast

Overnight
Mostly cloudy, with a low around 26. South wind around 8 mph.
Friday
A chance of sprinkles between 3pm and 4pm, then a slight chance of rain after 4pm. Increasing clouds, with a high near 45. West wind 8 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 20%.
Friday Night
A 40 percent chance of snow, mainly before midnight. Mostly cloudy, with a low around 22. West wind 10 to 14 mph, with gusts as high as 23 mph.
Saturday
Partly sunny, with a high near 28. West wind 10 to 14 mph, with gusts as high as 22 mph.
Saturday Night
Mostly clear, with a low around 12. Northwest wind 6 to 9 mph.
Sunday
Mostly sunny, with a high near 31.
Sunday Night
Partly cloudy, with a low around 15.
M.L.King Day
Sunny, with a high near 25.
Monday Night
Mostly clear, with a low around 11.
Tuesday
Sunny, with a high near 37.
Tuesday Night
Mostly clear, with a low around 25.
Wednesday
Mostly sunny, with a high near 45.
Wednesday Night
Partly cloudy, with a low around 23.
Thursday
Partly sunny, with a high near 43.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Cahokia IL
 38.57°N 90.18°W (Elev. 407 ft)
Last Update:
1:26 am CST Jan 16, 2026
Forecast Valid:
1am CST Jan 16, 2026-6pm CST Jan 22, 2026
 
Forecast Discussion
 
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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