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.

Fair

44°F

7°C

Humidity 53%
Wind Speed N 7 mph
Barometer 30.00 in (1015.7 mb)
Dewpoint 28°F (-2°C)
Visibility 10.00 mi
Wind Chill40°F (4°C)
Last update 16 Nov 6:53 am CST
Extended Forecast for

Cahokia IL

  • Today

    Today: Sunny, with a high near 59. North wind 3 to 6 mph.

    High: 59 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 37. Calm wind.

    Low: 37 °F

    Mostly Clear

  • Monday

    Monday: Increasing clouds, with a high near 60. Light east wind becoming southeast 5 to 10 mph in the morning.

    High: 60 °F

    Increasing
    Clouds

  • Monday Night

    Monday Night: A chance of showers before 9pm, then a chance of showers and thunderstorms between 9pm and midnight, then showers likely and possibly a thunderstorm after midnight. Mostly cloudy, with a low around 50. Southeast wind 7 to 9 mph. Chance of precipitation is 70%.

    Low: 50 °F

    Chance
    T-storms then
    Showers
    Likely

  • Tuesday

    Tuesday: A 30 percent chance of showers before noon. Partly sunny, with a high near 72. Southeast wind around 8 mph becoming southwest in the afternoon.

    High: 72 °F

    Chance
    Showers then
    Partly Sunny

  • Tuesday Night

    Tuesday Night: A 20 percent chance of rain. Mostly cloudy, with a low around 52.

    Low: 52 °F

    Slight Chance
    Rain

  • Wednesday

    Wednesday: A 20 percent chance of rain after noon. Mostly cloudy, with a high near 67.

    High: 67 °F

    Mostly Cloudy
    then Slight
    Chance Rain

  • Wednesday Night

    Wednesday Night: Rain likely, mainly after midnight. Mostly cloudy, with a low around 54. Chance of precipitation is 60%.

    Low: 54 °F

    Chance Rain
    then Rain
    Likely

  • Thursday

    Thursday: Rain and possibly a thunderstorm. High near 67. Chance of precipitation is 80%.

    High: 67 °F

    Rain

Detailed Forecast

Today
Sunny, with a high near 59. North wind 3 to 6 mph.
Tonight
Mostly clear, with a low around 37. Calm wind.
Monday
Increasing clouds, with a high near 60. Light east wind becoming southeast 5 to 10 mph in the morning.
Monday Night
A chance of showers before 9pm, then a chance of showers and thunderstorms between 9pm and midnight, then showers likely and possibly a thunderstorm after midnight. Mostly cloudy, with a low around 50. Southeast wind 7 to 9 mph. Chance of precipitation is 70%.
Tuesday
A 30 percent chance of showers before noon. Partly sunny, with a high near 72. Southeast wind around 8 mph becoming southwest in the afternoon.
Tuesday Night
A 20 percent chance of rain. Mostly cloudy, with a low around 52.
Wednesday
A 20 percent chance of rain after noon. Mostly cloudy, with a high near 67.
Wednesday Night
Rain likely, mainly after midnight. Mostly cloudy, with a low around 54. Chance of precipitation is 60%.
Thursday
Rain and possibly a thunderstorm. High near 67. Chance of precipitation is 80%.
Thursday Night
Rain likely, with thunderstorms also possible after midnight. Mostly cloudy, with a low around 56. Chance of precipitation is 70%.
Friday
A 50 percent chance of rain. Partly sunny, with a high near 66.
Friday Night
A 30 percent chance of rain. Mostly cloudy, with a low around 43.
Saturday
Partly sunny, with a high near 54.
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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:
6:26 am CST Nov 16, 2025
Forecast Valid:
7am CST Nov 16, 2025-6pm CST Nov 22, 2025
 
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