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.

Light Rain

76°F

24°C

Humidity 85%
Wind Speed Calm
Barometer 29.90 in (1012.0 mb)
Dewpoint 71°F (22°C)
Visibility 10.00 mi
Heat Index77°F (25°C)
Last update 9 Jul 4:53 pm CDT
Extended Forecast for

Caseyville IL

  • This Afternoon

    This Afternoon: Scattered showers and thunderstorms. Cloudy, with a high near 89. North wind around 6 mph. Chance of precipitation is 40%.

    High: 89 °F

    Scattered
    T-storms

  • Tonight

    Tonight: Showers and thunderstorms likely, mainly between 1am and 5am. Mostly cloudy, with a low around 74. South wind 3 to 7 mph. Chance of precipitation is 70%.

    Low: 74 °F

    T-storms
    Likely

  • Friday

    Friday: Scattered showers and thunderstorms, mainly after 4pm. Mostly cloudy, then gradually becoming sunny, with a high near 90. Heat index values as high as 102. South wind 5 to 7 mph becoming northwest in the morning. Chance of precipitation is 30%.

    High: 90 °F

    Scattered
    T-storms

  • Friday Night

    Friday Night: Showers and thunderstorms likely, mainly after 1am. Mostly cloudy, with a low around 72. Northwest wind around 6 mph becoming calm in the evening. Chance of precipitation is 70%.

    Low: 72 °F

    T-storms
    Likely

  • Saturday

    Saturday: A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 86. Calm wind becoming northwest around 6 mph in the morning.

    High: 86 °F

    Chance
    T-storms

  • Saturday Night

    Saturday Night: A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 70.

    Low: 70 °F

    Chance
    T-storms

  • Sunday

    Sunday: A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 87.

    High: 87 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 69.

    Low: 69 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 89.

    High: 89 °F

    Sunny

Detailed Forecast

This Afternoon
Scattered showers and thunderstorms. Cloudy, with a high near 89. North wind around 6 mph. Chance of precipitation is 40%.
Tonight
Showers and thunderstorms likely, mainly between 1am and 5am. Mostly cloudy, with a low around 74. South wind 3 to 7 mph. Chance of precipitation is 70%.
Friday
Scattered showers and thunderstorms, mainly after 4pm. Mostly cloudy, then gradually becoming sunny, with a high near 90. Heat index values as high as 102. South wind 5 to 7 mph becoming northwest in the morning. Chance of precipitation is 30%.
Friday Night
Showers and thunderstorms likely, mainly after 1am. Mostly cloudy, with a low around 72. Northwest wind around 6 mph becoming calm in the evening. Chance of precipitation is 70%.
Saturday
A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 86. Calm wind becoming northwest around 6 mph in the morning.
Saturday Night
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 70.
Sunday
A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 87.
Sunday Night
Mostly clear, with a low around 69.
Monday
Sunny, with a high near 89.
Monday Night
Mostly clear, with a low around 71.
Tuesday
Sunny, with a high near 90.
Tuesday Night
Mostly clear, with a low around 72.
Wednesday
Sunny, with a high near 92.
Wednesday Night
Mostly clear, with a low around 73.
Thursday
Sunny, with a high near 93.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Caseyville IL
 38.64°N 90.03°W (Elev. 446 ft)
Last Update:
2:41 pm CDT Jul 9, 2026
Forecast Valid:
4pm CDT Jul 9, 2026-6pm CDT Jul 16, 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