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

52°F

11°C

Humidity 59%
Wind Speed W 5 mph
Barometer 29.86 in (1011.1 mb)
Dewpoint 38°F (3°C)
Visibility 10.00 mi
Wind Chill51°F (11°C)
Last update 6 Jan 9:53 pm CST
Extended Forecast for

Cahokia IL

  • Tonight

    Tonight: Mostly clear, with a low around 34. Light and variable wind.

    Low: 34 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 61. Calm wind becoming south 5 to 7 mph in the afternoon.

    High: 61 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Increasing clouds, with a low around 45. Southeast wind around 6 mph.

    Low: 45 °F

    Increasing
    Clouds

  • Thursday

    Thursday: Rain. High near 65. Southeast wind 7 to 14 mph, with gusts as high as 26 mph. Chance of precipitation is 90%.

    High: 65 °F

    Rain

  • Thursday Night

    Thursday Night: A chance of showers and thunderstorms before 9pm, then a chance of rain, mainly between 9pm and midnight. Mostly cloudy, with a low around 50. South wind 6 to 11 mph becoming west after midnight. Winds could gust as high as 23 mph. Chance of precipitation is 50%.

    Low: 50 °F

    Chance
    Showers then
    Slight Chance
    Rain

  • Friday

    Friday: Mostly cloudy, with a high near 57.

    High: 57 °F

    Mostly Cloudy

  • Friday Night

    Friday Night: A 30 percent chance of rain. Mostly cloudy, with a low around 41.

    Low: 41 °F

    Chance Rain

  • Saturday

    Saturday: Partly sunny, with a high near 48.

    High: 48 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 26.

    Low: 26 °F

    Partly Cloudy

Detailed Forecast

Tonight
Mostly clear, with a low around 34. Light and variable wind.
Wednesday
Sunny, with a high near 61. Calm wind becoming south 5 to 7 mph in the afternoon.
Wednesday Night
Increasing clouds, with a low around 45. Southeast wind around 6 mph.
Thursday
Rain. High near 65. Southeast wind 7 to 14 mph, with gusts as high as 26 mph. Chance of precipitation is 90%.
Thursday Night
A chance of showers and thunderstorms before 9pm, then a chance of rain, mainly between 9pm and midnight. Mostly cloudy, with a low around 50. South wind 6 to 11 mph becoming west after midnight. Winds could gust as high as 23 mph. Chance of precipitation is 50%.
Friday
Mostly cloudy, with a high near 57.
Friday Night
A 30 percent chance of rain. Mostly cloudy, with a low around 41.
Saturday
Partly sunny, with a high near 48.
Saturday Night
Partly cloudy, with a low around 26.
Sunday
Mostly sunny, with a high near 39.
Sunday Night
Mostly clear, with a low around 26.
Monday
Sunny, with a high near 51.
Monday Night
Mostly clear, with a low around 32.
Tuesday
Mostly sunny, with a high near 50.
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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:
5:21 pm CST Jan 6, 2026
Forecast Valid:
10pm CST Jan 6, 2026-6pm CST Jan 13, 2026
 
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