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.

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

  • Overnight

    Overnight: Showers and possibly a thunderstorm. Patchy fog. Low around 52. Southeast wind around 5 mph. Chance of precipitation is 90%.

    Low: 52 °F

    Showers and
    Patchy Fog

  • Thursday

    Thursday: Showers and thunderstorms likely before 9am, then a slight chance of showers between 9am and 10am. Patchy fog before noon. Otherwise, mostly cloudy, with a high near 67. West wind 3 to 8 mph. Chance of precipitation is 60%.

    High: 67 °F

    Showers
    Likely and
    Patchy Fog
    then Mostly
    Cloudy

  • Thursday Night

    Thursday Night: A 30 percent chance of showers and thunderstorms, mainly between 1am and 4am. Mostly cloudy, with a low around 57. Light and variable wind becoming southeast 5 to 7 mph after midnight.

    Low: 57 °F

    Chance
    T-storms

  • Friday

    Friday: A slight chance of showers and thunderstorms before 9am, then a slight chance of showers after noon. Partly sunny, with a high near 79. South wind 9 to 18 mph, with gusts as high as 32 mph. Chance of precipitation is 20%.

    High: 79 °F

    Slight Chance
    T-storms then
    Slight Chance
    Showers

  • Friday Night

    Friday Night: A chance of showers and thunderstorms, then showers and possibly a thunderstorm after midnight. Low around 59. South wind 11 to 13 mph, with gusts as high as 24 mph. Chance of precipitation is 90%.

    Low: 59 °F

    Chance
    T-storms then
    Showers

  • Saturday

    Saturday: A 50 percent chance of showers before noon. Mostly cloudy, with a high near 70.

    High: 70 °F

    Chance
    Showers then
    Partly Sunny

  • Saturday Night

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

    Low: 41 °F

    Partly Cloudy

  • Sunday

    Sunday: Sunny, with a high near 66.

    High: 66 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 47.

    Low: 47 °F

    Mostly Clear

Detailed Forecast

Overnight
Showers and possibly a thunderstorm. Patchy fog. Low around 52. Southeast wind around 5 mph. Chance of precipitation is 90%.
Thursday
Showers and thunderstorms likely before 9am, then a slight chance of showers between 9am and 10am. Patchy fog before noon. Otherwise, mostly cloudy, with a high near 67. West wind 3 to 8 mph. Chance of precipitation is 60%.
Thursday Night
A 30 percent chance of showers and thunderstorms, mainly between 1am and 4am. Mostly cloudy, with a low around 57. Light and variable wind becoming southeast 5 to 7 mph after midnight.
Friday
A slight chance of showers and thunderstorms before 9am, then a slight chance of showers after noon. Partly sunny, with a high near 79. South wind 9 to 18 mph, with gusts as high as 32 mph. Chance of precipitation is 20%.
Friday Night
A chance of showers and thunderstorms, then showers and possibly a thunderstorm after midnight. Low around 59. South wind 11 to 13 mph, with gusts as high as 24 mph. Chance of precipitation is 90%.
Saturday
A 50 percent chance of showers before noon. Mostly cloudy, with a high near 70.
Saturday Night
Partly cloudy, with a low around 41.
Sunday
Sunny, with a high near 66.
Sunday Night
Mostly clear, with a low around 47.
Monday
Sunny, with a high near 78.
Monday Night
A 30 percent chance of showers and thunderstorms. Mostly clear, with a low around 60.
Tuesday
Showers and possibly a thunderstorm. High near 78. Chance of precipitation is 80%.
Tuesday Night
Showers and possibly a thunderstorm. Low around 52. Chance of precipitation is 90%.
Wednesday
Showers likely. Mostly cloudy, with a high near 63. Chance of precipitation is 70%.
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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:
4:06 am CST Mar 5, 2026
Forecast Valid:
4am CST Mar 5, 2026-6pm CDT Mar 11, 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