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

  • Today

    Today: Showers and thunderstorms, mainly before 5pm. Patchy fog before 10am. High near 61. Light and variable wind. Chance of precipitation is 80%.

    High: 61 °F

    Scattered
    T-storms and
    Patchy Fog
    then T-storms

  • Tonight

    Tonight: Showers and thunderstorms before 3am, then showers and possibly a thunderstorm, mainly after 3am. Patchy fog after 10pm. Low around 55. Light south wind. Chance of precipitation is 80%.

    Low: 55 °F

    T-storms and
    Patchy Fog

  • Thursday

    Thursday: Showers likely and possibly a thunderstorm before 9am, then isolated showers between 9am and 10am. Patchy fog before 7am. Otherwise, mostly cloudy, with a high near 70. Light and variable wind becoming west 5 to 8 mph. Chance of precipitation is 60%.

    High: 70 °F

    Showers
    Likely and
    Patchy Fog
    then Partly
    Sunny

  • Thursday Night

    Thursday Night: A chance of showers before 9pm, then a chance of showers and thunderstorms between 9pm and 3am, then a chance of showers after 3am. Mostly cloudy, with a low around 59. South wind 3 to 7 mph. Chance of precipitation is 50%.

    Low: 59 °F

    Chance
    Showers

  • Friday

    Friday: A 40 percent chance of showers, mainly before noon. Partly sunny, with a high near 79. South wind 8 to 16 mph, with gusts as high as 28 mph.

    High: 79 °F

    Chance
    Showers

  • Friday Night

    Friday Night: A chance of showers and thunderstorms, then showers and possibly a thunderstorm after midnight. Low around 56. Chance of precipitation is 90%.

    Low: 56 °F

    Chance
    T-storms then
    Showers

  • Saturday

    Saturday: A 40 percent chance of showers before noon. Partly sunny, with a high near 67.

    High: 67 °F

    Chance
    Showers then
    Mostly Sunny

  • Saturday Night

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

    Low: 41 °F

    Partly Cloudy

  • Sunday

    Sunday: Sunny, with a high near 68.

    High: 68 °F

    Sunny

Detailed Forecast

Today
Showers and thunderstorms, mainly before 5pm. Patchy fog before 10am. High near 61. Light and variable wind. Chance of precipitation is 80%.
Tonight
Showers and thunderstorms before 3am, then showers and possibly a thunderstorm, mainly after 3am. Patchy fog after 10pm. Low around 55. Light south wind. Chance of precipitation is 80%.
Thursday
Showers likely and possibly a thunderstorm before 9am, then isolated showers between 9am and 10am. Patchy fog before 7am. Otherwise, mostly cloudy, with a high near 70. Light and variable wind becoming west 5 to 8 mph. Chance of precipitation is 60%.
Thursday Night
A chance of showers before 9pm, then a chance of showers and thunderstorms between 9pm and 3am, then a chance of showers after 3am. Mostly cloudy, with a low around 59. South wind 3 to 7 mph. Chance of precipitation is 50%.
Friday
A 40 percent chance of showers, mainly before noon. Partly sunny, with a high near 79. South wind 8 to 16 mph, with gusts as high as 28 mph.
Friday Night
A chance of showers and thunderstorms, then showers and possibly a thunderstorm after midnight. Low around 56. Chance of precipitation is 90%.
Saturday
A 40 percent chance of showers before noon. Partly sunny, with a high near 67.
Saturday Night
Partly cloudy, with a low around 41.
Sunday
Sunny, with a high near 68.
Sunday Night
Mostly clear, with a low around 49.
Monday
Sunny, with a high near 79.
Monday Night
A 30 percent chance of showers and thunderstorms. Mostly clear, with a low around 61.
Tuesday
Showers and thunderstorms likely. Mostly cloudy, with a high near 78. 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:
9:16 am CST Mar 4, 2026
Forecast Valid:
9am CST Mar 4, 2026-6pm CDT Mar 10, 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