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.

Overcast

70°F

21°C

Humidity 90%
Wind Speed S 5 mph
Barometer 29.93 in (1013.1 mb)
Dewpoint 67°F (19°C)
Visibility 10.00 mi
Last update 22 Sep 11:53 am CDT
Extended Forecast for

Cahokia IL

  • This Afternoon

    This Afternoon: Mostly cloudy, with a high near 78. South wind around 6 mph.

    High: 78 °F

    Mostly Cloudy

  • Tonight

    Tonight: Patchy fog after 3am. Otherwise, partly cloudy, with a low around 64. Light south wind.

    Low: 64 °F

    Partly Cloudy
    then Patchy
    Fog

  • Tuesday

    Tuesday: Scattered showers and thunderstorms, then showers likely and possibly a thunderstorm after 4pm. Areas of fog before 9am. Otherwise, mostly cloudy, with a high near 82. Calm wind becoming south around 6 mph in the morning. Chance of precipitation is 60%.

    High: 82 °F

    Areas Fog
    then Showers
    Likely

  • Tuesday Night

    Tuesday Night: Showers and possibly a thunderstorm. Low around 66. Light southeast wind. Chance of precipitation is 80%.

    Low: 66 °F

    Showers

  • Wednesday

    Wednesday: Showers, with thunderstorms also possible after 1pm. High near 78. Southeast wind 5 to 9 mph becoming north in the afternoon. Chance of precipitation is 80%.

    High: 78 °F

    Showers

  • Wednesday Night

    Wednesday Night: A 50 percent chance of showers. Mostly cloudy, with a low around 62.

    Low: 62 °F

    Chance
    Showers

  • Thursday

    Thursday: A chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 76. Chance of precipitation is 40%.

    High: 76 °F

    Chance
    Showers

  • Thursday Night

    Thursday Night: A 20 percent chance of showers. Partly cloudy, with a low around 58.

    Low: 58 °F

    Slight Chance
    Showers

  • Friday

    Friday: A 20 percent chance of showers after 1pm. Mostly sunny, with a high near 78.

    High: 78 °F

    Mostly Sunny
    then Slight
    Chance
    Showers

Detailed Forecast

This Afternoon
Mostly cloudy, with a high near 78. South wind around 6 mph.
Tonight
Patchy fog after 3am. Otherwise, partly cloudy, with a low around 64. Light south wind.
Tuesday
Scattered showers and thunderstorms, then showers likely and possibly a thunderstorm after 4pm. Areas of fog before 9am. Otherwise, mostly cloudy, with a high near 82. Calm wind becoming south around 6 mph in the morning. Chance of precipitation is 60%.
Tuesday Night
Showers and possibly a thunderstorm. Low around 66. Light southeast wind. Chance of precipitation is 80%.
Wednesday
Showers, with thunderstorms also possible after 1pm. High near 78. Southeast wind 5 to 9 mph becoming north in the afternoon. Chance of precipitation is 80%.
Wednesday Night
A 50 percent chance of showers. Mostly cloudy, with a low around 62.
Thursday
A chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 76. Chance of precipitation is 40%.
Thursday Night
A 20 percent chance of showers. Partly cloudy, with a low around 58.
Friday
A 20 percent chance of showers after 1pm. Mostly sunny, with a high near 78.
Friday Night
Mostly clear, with a low around 57.
Saturday
Sunny, with a high near 83.
Saturday Night
Mostly clear, with a low around 59.
Sunday
Sunny, with a high near 84.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Cahokia IL
 38.55°N 90.15°W (Elev. 407 ft)
Last Update:
10:26 am CDT Sep 22, 2025
Forecast Valid:
12pm CDT Sep 22, 2025-6pm CDT Sep 28, 2025
 
Forecast Discussion
 
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Additional Resources

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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