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

63°F

17°C

Humidity 63%
Wind Speed SW 5 mph
Barometer 30.04 in (1017.0 mb)
Dewpoint 50°F (10°C)
Visibility 10.00 mi
Last update 22 Apr 3:53 am CDT
Extended Forecast for

Cahokia IL

  • Today

    Today: Mostly sunny, with a high near 81. Southwest wind 6 to 8 mph.

    High: 81 °F

    Mostly Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 58. South wind around 6 mph.

    Low: 58 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 83. South wind 6 to 15 mph, with gusts as high as 26 mph.

    High: 83 °F

    Sunny

  • Thursday Night

    Thursday Night: Showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 64. South wind 10 to 14 mph, with gusts as high as 23 mph. Chance of precipitation is 60%.

    Low: 64 °F

    Partly Cloudy
    then Showers
    Likely

  • Friday

    Friday: Showers and possibly a thunderstorm. High near 77. South wind 9 to 11 mph becoming west in the afternoon. Chance of precipitation is 90%.

    High: 77 °F

    Showers

  • Friday Night

    Friday Night: A 20 percent chance of showers before 1am. Partly cloudy, with a low around 56.

    Low: 56 °F

    Slight Chance
    Showers

  • Saturday

    Saturday: Mostly sunny, with a high near 76.

    High: 76 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 54.

    Low: 54 °F

    Partly Cloudy

  • Sunday

    Sunday: A 20 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 77.

    High: 77 °F

    Partly Sunny
    then Slight
    Chance
    T-storms

Detailed Forecast

Today
Mostly sunny, with a high near 81. Southwest wind 6 to 8 mph.
Tonight
Mostly clear, with a low around 58. South wind around 6 mph.
Thursday
Sunny, with a high near 83. South wind 6 to 15 mph, with gusts as high as 26 mph.
Thursday Night
Showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 64. South wind 10 to 14 mph, with gusts as high as 23 mph. Chance of precipitation is 60%.
Friday
Showers and possibly a thunderstorm. High near 77. South wind 9 to 11 mph becoming west in the afternoon. Chance of precipitation is 90%.
Friday Night
A 20 percent chance of showers before 1am. Partly cloudy, with a low around 56.
Saturday
Mostly sunny, with a high near 76.
Saturday Night
Partly cloudy, with a low around 54.
Sunday
A 20 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 77.
Sunday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 61. Chance of precipitation is 60%.
Monday
Showers likely and possibly a thunderstorm. Partly sunny, with a high near 80. Chance of precipitation is 70%.
Monday Night
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 53.
Tuesday
Sunny, with a high near 72.
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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:
4:11 am CDT Apr 22, 2026
Forecast Valid:
4am CDT Apr 22, 2026-6pm CDT Apr 28, 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