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

76°F

24°C

Humidity 60%
Wind Speed N 6 mph
Barometer 30.05 in (1017.2 mb)
Dewpoint 61°F (16°C)
Visibility 10.00 mi
Heat Index78°F (26°C)
Last update 19 Jun 9:53 am CDT
Extended Forecast for

Caseyville IL

  • Juneteenth

    Juneteenth: Sunny, with a high near 84. Light north wind.

    High: 84 °F

    Sunny

  • Tonight

    Tonight: Mostly cloudy, with a low around 66. Calm wind.

    Low: 66 °F

    Mostly Cloudy

  • Saturday

    Saturday: Isolated showers before 10am. Mostly sunny, with a high near 86. Light and variable wind. Chance of precipitation is 20%.

    High: 86 °F

    Isolated
    Showers then
    Mostly Sunny

  • Saturday Night

    Saturday Night: A chance of showers, with thunderstorms also possible after 5am. Mostly cloudy, with a low around 68. Light southeast wind. Chance of precipitation is 30%.

    Low: 68 °F

    Mostly Cloudy
    then Chance
    Showers

  • Sunday

    Sunday: Showers and thunderstorms, mainly after 7am. High near 85. South wind 8 to 16 mph, with gusts as high as 25 mph. Chance of precipitation is 90%.

    High: 85 °F

    T-storms

  • Sunday Night

    Sunday Night: Showers and thunderstorms. Low around 67. Chance of precipitation is 90%.

    Low: 67 °F

    T-storms

  • Monday

    Monday: A 20 percent chance of showers and thunderstorms before 1pm. Partly sunny, with a high near 79.

    High: 79 °F

    Slight Chance
    T-storms

  • Monday Night

    Monday Night: Partly cloudy, with a low around 62.

    Low: 62 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 81.

    High: 81 °F

    Mostly Sunny

Detailed Forecast

Juneteenth
Sunny, with a high near 84. Light north wind.
Tonight
Mostly cloudy, with a low around 66. Calm wind.
Saturday
Isolated showers before 10am. Mostly sunny, with a high near 86. Light and variable wind. Chance of precipitation is 20%.
Saturday Night
A chance of showers, with thunderstorms also possible after 5am. Mostly cloudy, with a low around 68. Light southeast wind. Chance of precipitation is 30%.
Sunday
Showers and thunderstorms, mainly after 7am. High near 85. South wind 8 to 16 mph, with gusts as high as 25 mph. Chance of precipitation is 90%.
Sunday Night
Showers and thunderstorms. Low around 67. Chance of precipitation is 90%.
Monday
A 20 percent chance of showers and thunderstorms before 1pm. Partly sunny, with a high near 79.
Monday Night
Partly cloudy, with a low around 62.
Tuesday
Mostly sunny, with a high near 81.
Tuesday Night
Partly cloudy, with a low around 63.
Wednesday
Mostly sunny, with a high near 83.
Wednesday Night
Mostly clear, with a low around 65.
Thursday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 83.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Caseyville IL
 38.66°N 90.06°W (Elev. 433 ft)
Last Update:
10:36 am CDT Jun 19, 2026
Forecast Valid:
10am CDT Jun 19, 2026-6pm CDT Jun 25, 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