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.

N/A

Humidity NA
Wind Speed NA
Barometer NA
Dewpoint N/A
Visibility NA
Last update *** Not a current observation ***
Extended Forecast for

Cahokia IL

  • Tonight

    Tonight: Patchy fog after 4am. Otherwise, mostly cloudy, then gradually becoming mostly clear, with a low around 35. Northwest wind 5 to 7 mph becoming calm after midnight.

    Low: 35 °F

    Mostly Cloudy
    then Patchy
    Fog

  • Sunday

    Sunday: Patchy fog before 7am. Otherwise, sunny, with a high near 67. Calm wind becoming southwest 5 to 8 mph in the morning.

    High: 67 °F

    Patchy Fog
    then Sunny

  • Sunday Night

    Sunday Night: Clear, with a low around 45. Southwest wind around 6 mph.

    Low: 45 °F

    Clear

  • Monday

    Monday: Sunny, with a high near 78. South wind 6 to 13 mph, with gusts as high as 21 mph.

    High: 78 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 61. South wind 6 to 9 mph.

    Low: 61 °F

    Mostly Clear

  • Tuesday

    Tuesday: A slight chance of showers and thunderstorms before 9am, then a slight chance of showers between 9am and noon, then a chance of showers and thunderstorms after noon. Partly sunny, with a high near 82. Chance of precipitation is 50%.

    High: 82 °F

    Slight Chance
    T-storms then
    Chance
    T-storms

  • Tuesday Night

    Tuesday Night: Showers and possibly a thunderstorm. Low around 54. Chance of precipitation is 90%.

    Low: 54 °F

    Showers

  • Wednesday

    Wednesday: Showers and possibly a thunderstorm before noon, then showers likely. High near 67. Chance of precipitation is 100%.

    High: 67 °F

    Showers then
    Showers
    Likely

  • Wednesday Night

    Wednesday Night: A 20 percent chance of showers before midnight. Partly cloudy, with a low around 34.

    Low: 34 °F

    Slight Chance
    Showers then
    Mostly Clear

Detailed Forecast

Tonight
Patchy fog after 4am. Otherwise, mostly cloudy, then gradually becoming mostly clear, with a low around 35. Northwest wind 5 to 7 mph becoming calm after midnight.
Sunday
Patchy fog before 7am. Otherwise, sunny, with a high near 67. Calm wind becoming southwest 5 to 8 mph in the morning.
Sunday Night
Clear, with a low around 45. Southwest wind around 6 mph.
Monday
Sunny, with a high near 78. South wind 6 to 13 mph, with gusts as high as 21 mph.
Monday Night
Mostly clear, with a low around 61. South wind 6 to 9 mph.
Tuesday
A slight chance of showers and thunderstorms before 9am, then a slight chance of showers between 9am and noon, then a chance of showers and thunderstorms after noon. Partly sunny, with a high near 82. Chance of precipitation is 50%.
Tuesday Night
Showers and possibly a thunderstorm. Low around 54. Chance of precipitation is 90%.
Wednesday
Showers and possibly a thunderstorm before noon, then showers likely. High near 67. Chance of precipitation is 100%.
Wednesday Night
A 20 percent chance of showers before midnight. Partly cloudy, with a low around 34.
Thursday
Sunny, with a high near 54.
Thursday Night
Mostly cloudy, with a low around 42.
Friday
Partly sunny, with a high near 67.
Friday Night
Mostly cloudy, with a low around 39.
Saturday
Mostly cloudy, with a high near 57.
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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:
9:21 pm CST Mar 7, 2026
Forecast Valid:
9pm CST Mar 7, 2026-6pm CDT Mar 14, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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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