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.

A Few Clouds

88°F

31°C

Humidity 63%
Wind Speed SE 8 mph
Barometer 29.92 in (1012.8 mb)
Dewpoint 74°F (23°C)
Visibility 10.00 mi
Heat Index97°F (36°C)
Last update 15 Jul 4:53 pm CDT
Extended Forecast for

Cahokia IL

  • This Afternoon

    This Afternoon: A 40 percent chance of showers and thunderstorms. Cloudy, with a high near 90. South wind around 6 mph.

    High: 90 °F

    Chance
    T-storms

  • Tonight

    Tonight: A 30 percent chance of showers and thunderstorms, mainly before 7pm. Mostly cloudy, then gradually becoming mostly clear, with a low around 73. Southwest wind 3 to 5 mph.

    Low: 73 °F

    Chance
    T-storms then
    Mostly Clear

  • Wednesday

    Wednesday: A slight chance of showers and thunderstorms before 1pm, then a slight chance of showers and thunderstorms after 2pm. Sunny, with a high near 96. Heat index values as high as 107. Southwest wind 5 to 9 mph. Chance of precipitation is 20%.

    High: 96 °F

    Slight Chance
    Showers then
    Slight Chance
    T-storms

  • Wednesday Night

    Wednesday Night: A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 77. Southwest wind 3 to 7 mph.

    Low: 77 °F

    Slight Chance
    T-storms

  • Thursday

    Thursday: A 50 percent chance of showers and thunderstorms, mainly after 1pm. Mostly sunny, with a high near 93. West wind 5 to 7 mph.

    High: 93 °F

    Slight Chance
    T-storms then
    Chance
    T-storms

  • Thursday Night

    Thursday Night: A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 72.

    Low: 72 °F

    Chance
    T-storms

  • Friday

    Friday: A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 87.

    High: 87 °F

    Chance
    T-storms

  • Friday Night

    Friday Night: A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 74.

    Low: 74 °F

    Slight Chance
    T-storms

  • Saturday

    Saturday: A 30 percent chance of showers and thunderstorms. Partly sunny, with a high near 93.

    High: 93 °F

    Chance
    T-storms

Detailed Forecast

This Afternoon
A 40 percent chance of showers and thunderstorms. Cloudy, with a high near 90. South wind around 6 mph.
Tonight
A 30 percent chance of showers and thunderstorms, mainly before 7pm. Mostly cloudy, then gradually becoming mostly clear, with a low around 73. Southwest wind 3 to 5 mph.
Wednesday
A slight chance of showers and thunderstorms before 1pm, then a slight chance of showers and thunderstorms after 2pm. Sunny, with a high near 96. Heat index values as high as 107. Southwest wind 5 to 9 mph. Chance of precipitation is 20%.
Wednesday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 77. Southwest wind 3 to 7 mph.
Thursday
A 50 percent chance of showers and thunderstorms, mainly after 1pm. Mostly sunny, with a high near 93. West wind 5 to 7 mph.
Thursday Night
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 72.
Friday
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 87.
Friday Night
A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 74.
Saturday
A 30 percent chance of showers and thunderstorms. Partly sunny, with a high near 93.
Saturday Night
A 30 percent chance of showers and thunderstorms, mainly after 1am. Partly cloudy, with a low around 76.
Sunday
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 96.
Sunday Night
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 75.
Monday
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 94.
Monday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 76.
Tuesday
Sunny and hot, with a high near 98.
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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:
4:21 pm CDT Jul 15, 2025
Forecast Valid:
5pm CDT Jul 15, 2025-6pm CDT Jul 22, 2025
 
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