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.

Light Rain

70°F

21°C

Humidity 87%
Wind Speed SE 5 mph
Barometer 29.87 in (1011.2 mb)
Dewpoint 66°F (19°C)
Visibility 10.00 mi
Last update 15 Apr 3:53 pm CDT
Extended Forecast for

Cahokia IL

  • This Afternoon

    This Afternoon: A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 75. South wind around 9 mph.

    High: 75 °F

    Chance
    T-storms

  • Tonight

    Tonight: Showers and thunderstorms before 4am, then a chance of showers. Low around 62. Southwest wind 7 to 11 mph, with gusts as high as 22 mph. Chance of precipitation is 80%.

    Low: 62 °F

    T-storms

  • Thursday

    Thursday: Mostly cloudy, then gradually becoming sunny, with a high near 84. West wind 6 to 8 mph.

    High: 84 °F

    Decreasing
    Clouds

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 59. Southwest wind around 5 mph becoming light and variable in the evening.

    Low: 59 °F

    Mostly Clear

  • Friday

    Friday: A 40 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 87. South wind 5 to 14 mph, with gusts as high as 24 mph.

    High: 87 °F

    Mostly Sunny
    then Chance
    T-storms

  • Friday Night

    Friday Night: A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 1am. Low around 53. Chance of precipitation is 80%.

    Low: 53 °F

    Chance
    T-storms then
    Showers

  • Saturday

    Saturday: A chance of showers and thunderstorms. Partly sunny, with a high near 64. Chance of precipitation is 50%.

    High: 64 °F

    Chance
    Showers

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 41.

    Low: 41 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 66.

    High: 66 °F

    Sunny

Detailed Forecast

This Afternoon
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 75. South wind around 9 mph.
Tonight
Showers and thunderstorms before 4am, then a chance of showers. Low around 62. Southwest wind 7 to 11 mph, with gusts as high as 22 mph. Chance of precipitation is 80%.
Thursday
Mostly cloudy, then gradually becoming sunny, with a high near 84. West wind 6 to 8 mph.
Thursday Night
Mostly clear, with a low around 59. Southwest wind around 5 mph becoming light and variable in the evening.
Friday
A 40 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 87. South wind 5 to 14 mph, with gusts as high as 24 mph.
Friday Night
A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 1am. Low around 53. Chance of precipitation is 80%.
Saturday
A chance of showers and thunderstorms. Partly sunny, with a high near 64. Chance of precipitation is 50%.
Saturday Night
Mostly clear, with a low around 41.
Sunday
Sunny, with a high near 66.
Sunday Night
Clear, with a low around 43.
Monday
Sunny, with a high near 74.
Monday Night
Mostly clear, with a low around 52.
Tuesday
Sunny, with a high near 78.
Tuesday Night
Partly cloudy, with a low around 56.
Wednesday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 79.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Cahokia IL
 38.55°N 90.18°W (Elev. 407 ft)
Last Update:
3:31 pm CDT Apr 15, 2026
Forecast Valid:
4pm CDT Apr 15, 2026-6pm CDT Apr 22, 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