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

38°F

3°C

Humidity 93%
Wind Speed Calm
Barometer 29.98 in (1015.3 mb)
Dewpoint 36°F (2°C)
Visibility 10.00 mi
Last update 27 Feb 7:53 am CST
Extended Forecast for

Cahokia IL

  • Today

    Today: Sunny, with a high near 72. Light south wind becoming southwest 10 to 15 mph in the morning. Winds could gust as high as 24 mph.

    High: 72 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 41. Southwest wind 5 to 7 mph becoming light and variable after midnight.

    Low: 41 °F

    Mostly Clear

  • Saturday

    Saturday: A 20 percent chance of rain after noon. Mostly sunny, with a high near 67. Light and variable wind becoming south 5 to 7 mph in the morning.

    High: 67 °F

    Mostly Sunny
    then Slight
    Chance Rain

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 31. North wind 7 to 10 mph, with gusts as high as 20 mph.

    Low: 31 °F

    Partly Cloudy

  • Sunday

    Sunday: A 20 percent chance of rain after noon. Mostly cloudy, with a high near 47. East wind around 10 mph.

    High: 47 °F

    Mostly Cloudy
    then Slight
    Chance Rain

  • Sunday Night

    Sunday Night: Rain and snow. Low around 33. Chance of precipitation is 80%. New snow accumulation of less than one inch possible.

    Low: 33 °F

    Rain/Snow

  • Monday

    Monday: A chance of rain and snow before noon, then a slight chance of rain. Mostly cloudy, with a high near 45. Chance of precipitation is 30%.

    High: 45 °F

    Chance
    Rain/Snow
    then Slight
    Chance Rain

  • Monday Night

    Monday Night: A 50 percent chance of rain. Cloudy, with a low around 36.

    Low: 36 °F

    Chance Rain

  • Tuesday

    Tuesday: Rain. High near 54. Chance of precipitation is 80%.

    High: 54 °F

    Rain

Detailed Forecast

Today
Sunny, with a high near 72. Light south wind becoming southwest 10 to 15 mph in the morning. Winds could gust as high as 24 mph.
Tonight
Mostly clear, with a low around 41. Southwest wind 5 to 7 mph becoming light and variable after midnight.
Saturday
A 20 percent chance of rain after noon. Mostly sunny, with a high near 67. Light and variable wind becoming south 5 to 7 mph in the morning.
Saturday Night
Partly cloudy, with a low around 31. North wind 7 to 10 mph, with gusts as high as 20 mph.
Sunday
A 20 percent chance of rain after noon. Mostly cloudy, with a high near 47. East wind around 10 mph.
Sunday Night
Rain and snow. Low around 33. Chance of precipitation is 80%. New snow accumulation of less than one inch possible.
Monday
A chance of rain and snow before noon, then a slight chance of rain. Mostly cloudy, with a high near 45. Chance of precipitation is 30%.
Monday Night
A 50 percent chance of rain. Cloudy, with a low around 36.
Tuesday
Rain. High near 54. Chance of precipitation is 80%.
Tuesday Night
Rain likely, with thunderstorms also possible after midnight. Cloudy, with a low around 43. Chance of precipitation is 70%.
Wednesday
Rain likely. Cloudy, with a high near 63. Chance of precipitation is 60%.
Wednesday Night
Rain likely and possibly a thunderstorm. Cloudy, with a low around 52. Chance of precipitation is 70%.
Thursday
Rain likely. Partly sunny, with a high near 69. Chance of precipitation is 60%.
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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:
8:31 am CST Feb 27, 2026
Forecast Valid:
8am CST Feb 27, 2026-6pm CST Mar 5, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation