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.

A Few Clouds

84°F

29°C

Humidity 49%
Wind Speed S 16 G 26 mph
Barometer 29.78 in (1008.1 mb)
Dewpoint 63°F (17°C)
Visibility 10.00 mi
Heat Index85°F (29°C)
Last update 10 Mar 1:53 pm CDT
Extended Forecast for

Cahokia IL

  • This Afternoon

    This Afternoon: Mostly sunny, with a high near 82. South wind around 15 mph, with gusts as high as 26 mph.

    High: 82 °F

    Mostly Sunny

  • Tonight

    Tonight: Showers and thunderstorms likely, mainly after 5am. Mostly cloudy, with a low around 55. South wind 10 to 13 mph, with gusts as high as 25 mph. Chance of precipitation is 60%.

    Low: 55 °F

    Mostly Cloudy
    then T-storms
    Likely

  • Wednesday

    Wednesday: Rain and thunderstorms before 3pm, then a slight chance of rain between 3pm and 4pm. Temperature falling to around 52 by 4pm. Southwest wind 14 to 18 mph becoming northwest in the afternoon. Winds could gust as high as 30 mph. Chance of precipitation is 100%.

    High: 69 °F⇓

    T-storms then
    Rain Likely

  • Wednesday Night

    Wednesday Night: Mostly cloudy, then gradually becoming mostly clear, with a low around 32. Northwest wind 7 to 16 mph, with gusts as high as 28 mph.

    Low: 32 °F

    Decreasing
    Clouds

  • Thursday

    Thursday: Sunny, with a high near 57. Calm wind becoming southwest 5 to 9 mph in the morning.

    High: 57 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 42.

    Low: 42 °F

    Mostly Cloudy

  • Friday

    Friday: Partly sunny, with a high near 63.

    High: 63 °F

    Partly Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 36.

    Low: 36 °F

    Mostly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 68.

    High: 68 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
Mostly sunny, with a high near 82. South wind around 15 mph, with gusts as high as 26 mph.
Tonight
Showers and thunderstorms likely, mainly after 5am. Mostly cloudy, with a low around 55. South wind 10 to 13 mph, with gusts as high as 25 mph. Chance of precipitation is 60%.
Wednesday
Rain and thunderstorms before 3pm, then a slight chance of rain between 3pm and 4pm. Temperature falling to around 52 by 4pm. Southwest wind 14 to 18 mph becoming northwest in the afternoon. Winds could gust as high as 30 mph. Chance of precipitation is 100%.
Wednesday Night
Mostly cloudy, then gradually becoming mostly clear, with a low around 32. Northwest wind 7 to 16 mph, with gusts as high as 28 mph.
Thursday
Sunny, with a high near 57. Calm wind becoming southwest 5 to 9 mph in the morning.
Thursday Night
Mostly cloudy, with a low around 42.
Friday
Partly sunny, with a high near 63.
Friday Night
Mostly cloudy, with a low around 36.
Saturday
Mostly sunny, with a high near 68.
Saturday Night
A 20 percent chance of rain and thunderstorms after 1am. Mostly cloudy, with a low around 50.
Sunday
Rain and possibly a thunderstorm. High near 67. Breezy. Chance of precipitation is 80%.
Sunday Night
A chance of rain and snow. Mostly cloudy, with a low around 23. Chance of precipitation is 30%.
Monday
Sunny, with a high near 38.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Cahokia IL
 38.57°N 90.15°W (Elev. 407 ft)
Last Update:
2:06 pm CDT Mar 10, 2026
Forecast Valid:
2pm CDT Mar 10, 2026-6pm CDT Mar 16, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation