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

33°F

1°C

Humidity 30%
Wind Speed SW 3 mph
Barometer 30.27 in (1025.5 mb)
Dewpoint 5°F (-15°C)
Visibility 10.00 mi
Last update 17 Mar 2:53 pm CDT
Extended Forecast for

Caseyville IL

  • Tonight

    Tonight: A 40 percent chance of snow, mainly before 1am. Cloudy, with a low around 31. Southeast wind 6 to 13 mph, with gusts as high as 26 mph.

    Low: 31 °F

    Chance Snow

  • Wednesday

    Wednesday: Mostly cloudy through mid morning, then gradual clearing, with a high near 64. South wind 9 to 13 mph becoming west in the afternoon. Winds could gust as high as 22 mph.

    High: 64 °F

    Becoming
    Sunny

  • Wednesday Night

    Wednesday Night: Increasing clouds, with a low around 46. Light and variable wind becoming north around 5 mph after midnight.

    Low: 46 °F

    Increasing
    Clouds

  • Thursday

    Thursday: Mostly cloudy, then gradually becoming sunny, with a high near 73. South wind 5 to 8 mph becoming northwest in the afternoon.

    High: 73 °F

    Decreasing
    Clouds

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 45. North wind around 6 mph becoming calm after midnight.

    Low: 45 °F

    Mostly Clear

  • Friday

    Friday: Mostly sunny, with a high near 73.

    High: 73 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 50.

    Low: 50 °F

    Partly Cloudy

  • Saturday

    Saturday: Sunny, with a high near 80.

    High: 80 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 57.

    Low: 57 °F

    Mostly Clear

Detailed Forecast

Tonight
A 40 percent chance of snow, mainly before 1am. Cloudy, with a low around 31. Southeast wind 6 to 13 mph, with gusts as high as 26 mph.
Wednesday
Mostly cloudy through mid morning, then gradual clearing, with a high near 64. South wind 9 to 13 mph becoming west in the afternoon. Winds could gust as high as 22 mph.
Wednesday Night
Increasing clouds, with a low around 46. Light and variable wind becoming north around 5 mph after midnight.
Thursday
Mostly cloudy, then gradually becoming sunny, with a high near 73. South wind 5 to 8 mph becoming northwest in the afternoon.
Thursday Night
Mostly clear, with a low around 45. North wind around 6 mph becoming calm after midnight.
Friday
Mostly sunny, with a high near 73.
Friday Night
Partly cloudy, with a low around 50.
Saturday
Sunny, with a high near 80.
Saturday Night
Mostly clear, with a low around 57.
Sunday
Mostly sunny, with a high near 80.
Sunday Night
Partly cloudy, with a low around 41.
Monday
Mostly sunny, with a high near 56.
Monday Night
Mostly cloudy, with a low around 38.
Tuesday
Mostly sunny, with a high near 58.
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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:
2:56 pm CDT Mar 17, 2026
Forecast Valid:
3pm CDT Mar 17, 2026-6pm CDT Mar 24, 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