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

12°F

-11°C

Humidity 67%
Wind Speed W 6 mph
Barometer 30.23 in (1024.4 mb)
Dewpoint 3°F (-16°C)
Visibility 10.00 mi
Wind Chill2°F (-17°C)
Last update 18 Jan 3:53 am CST
Extended Forecast for

Cahokia IL

  • Today

    Today: Increasing clouds, with a high near 33. Southwest wind 6 to 11 mph, with gusts as high as 21 mph.

    High: 33 °F

    Increasing
    Clouds

  • Tonight

    Tonight: Cloudy during the early evening, then gradual clearing, with a low around 11. West wind 10 to 18 mph becoming northwest after midnight. Winds could gust as high as 33 mph.

    Low: 11 °F

    Gradual
    Clearing

  • M.L.King Day

    M.L.King Day: Sunny, with a high near 23. Northwest wind 8 to 17 mph, with gusts as high as 29 mph.

    High: 23 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 11. West wind 5 to 7 mph becoming calm.

    Low: 11 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 39. South wind 5 to 9 mph.

    High: 39 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 29.

    Low: 29 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 46.

    High: 46 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 22.

    Low: 22 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 38.

    High: 38 °F

    Mostly Sunny

Detailed Forecast

Today
Increasing clouds, with a high near 33. Southwest wind 6 to 11 mph, with gusts as high as 21 mph.
Tonight
Cloudy during the early evening, then gradual clearing, with a low around 11. West wind 10 to 18 mph becoming northwest after midnight. Winds could gust as high as 33 mph.
M.L.King Day
Sunny, with a high near 23. Northwest wind 8 to 17 mph, with gusts as high as 29 mph.
Monday Night
Mostly clear, with a low around 11. West wind 5 to 7 mph becoming calm.
Tuesday
Mostly sunny, with a high near 39. South wind 5 to 9 mph.
Tuesday Night
Partly cloudy, with a low around 29.
Wednesday
Mostly sunny, with a high near 46.
Wednesday Night
Partly cloudy, with a low around 22.
Thursday
Mostly sunny, with a high near 38.
Thursday Night
Partly cloudy, with a low around 27.
Friday
A 20 percent chance of rain. Mostly cloudy, with a high near 46.
Friday Night
A chance of rain and snow. Mostly cloudy, with a low around 23. Chance of precipitation is 40%.
Saturday
A 30 percent chance of snow. Partly sunny, with a high near 32.
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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:
3:16 am CST Jan 18, 2026
Forecast Valid:
4am CST Jan 18, 2026-6pm CST Jan 24, 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