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

89°F

32°C

Humidity 17%
Wind Speed NW 13 mph
Barometer 29.83 in (1009.7 mb)
Dewpoint 39°F (4°C)
Visibility 10.00 mi
Heat Index85°F (29°C)
Last update 20 Mar 3:53 pm CDT
Extended Forecast for

Cahokia IL

  • Tonight

    Tonight: Partly cloudy, with a low around 53. West wind 5 to 7 mph becoming light and variable in the evening.

    Low: 53 °F

    Partly Cloudy

  • Saturday

    Saturday: Sunny, with a high near 83. Calm wind becoming southwest around 6 mph in the afternoon.

    High: 83 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 63. South wind 5 to 7 mph.

    Low: 63 °F

    Mostly Clear

  • Sunday

    Sunday: Mostly sunny, with a high near 88. South wind 7 to 11 mph becoming northwest in the afternoon. Winds could gust as high as 20 mph.

    High: 88 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 41. North wind 10 to 15 mph, with gusts as high as 26 mph.

    Low: 41 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 59.

    High: 59 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 41.

    Low: 41 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Partly sunny, with a high near 61.

    High: 61 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: A 20 percent chance of rain and thunderstorms after 1am. Partly cloudy, with a low around 44.

    Low: 44 °F

    Partly Cloudy
    then Slight
    Chance
    T-storms

Detailed Forecast

Tonight
Partly cloudy, with a low around 53. West wind 5 to 7 mph becoming light and variable in the evening.
Saturday
Sunny, with a high near 83. Calm wind becoming southwest around 6 mph in the afternoon.
Saturday Night
Mostly clear, with a low around 63. South wind 5 to 7 mph.
Sunday
Mostly sunny, with a high near 88. South wind 7 to 11 mph becoming northwest in the afternoon. Winds could gust as high as 20 mph.
Sunday Night
Partly cloudy, with a low around 41. North wind 10 to 15 mph, with gusts as high as 26 mph.
Monday
Mostly sunny, with a high near 59.
Monday Night
Partly cloudy, with a low around 41.
Tuesday
Partly sunny, with a high near 61.
Tuesday Night
A 20 percent chance of rain and thunderstorms after 1am. Partly cloudy, with a low around 44.
Wednesday
Partly sunny, with a high near 68.
Wednesday Night
Partly cloudy, with a low around 52.
Thursday
A 20 percent chance of rain. Sunny, with a high near 80.
Thursday Night
A 40 percent chance of rain. Partly cloudy, with a low around 42.
Friday
A 30 percent chance of rain. Mostly cloudy, with a high near 55.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Cahokia IL
 38.57°N 90.18°W (Elev. 407 ft)
Last Update:
1:56 pm CDT Mar 20, 2026
Forecast Valid:
4pm CDT Mar 20, 2026-6pm CDT Mar 27, 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