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.

Mostly Cloudy

38°F

3°C

Humidity 89%
Wind Speed S 6 mph
Barometer 29.94 in (1013.9 mb)
Dewpoint 35°F (2°C)
Visibility 7.00 mi
Wind Chill33°F (1°C)
Last update 7 Dec 2:53 am CST
Extended Forecast for

Caseyville IL

  • Overnight

    Overnight: A chance of sprinkles after 5am. Cloudy, with a low around 37. South wind 3 to 5 mph.

    Low: 37 °F

    Chance
    Sprinkles

  • Sunday

    Sunday: A chance of sprinkles before 11am. Cloudy, with a high near 41. Light and variable wind becoming north 8 to 13 mph in the morning. Winds could gust as high as 21 mph.

    High: 41 °F

    Chance
    Sprinkles

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 23. North wind 7 to 11 mph, with gusts as high as 20 mph.

    Low: 23 °F

    Mostly Cloudy

  • Monday

    Monday: Mostly cloudy, then gradually becoming sunny, with a high near 35. North wind around 5 mph becoming calm in the morning.

    High: 35 °F

    Decreasing
    Clouds

  • Monday Night

    Monday Night: Partly cloudy, with a low around 26. Calm wind becoming south 5 to 9 mph in the evening.

    Low: 26 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 53.

    High: 53 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 41.

    Low: 41 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 49.

    High: 49 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: A 20 percent chance of snow after midnight. Mostly cloudy, with a low around 28.

    Low: 28 °F

    Mostly Cloudy
    then Slight
    Chance Snow

Detailed Forecast

Overnight
A chance of sprinkles after 5am. Cloudy, with a low around 37. South wind 3 to 5 mph.
Sunday
A chance of sprinkles before 11am. Cloudy, with a high near 41. Light and variable wind becoming north 8 to 13 mph in the morning. Winds could gust as high as 21 mph.
Sunday Night
Mostly cloudy, with a low around 23. North wind 7 to 11 mph, with gusts as high as 20 mph.
Monday
Mostly cloudy, then gradually becoming sunny, with a high near 35. North wind around 5 mph becoming calm in the morning.
Monday Night
Partly cloudy, with a low around 26. Calm wind becoming south 5 to 9 mph in the evening.
Tuesday
Mostly sunny, with a high near 53.
Tuesday Night
Mostly cloudy, with a low around 41.
Wednesday
Partly sunny, with a high near 49.
Wednesday Night
A 20 percent chance of snow after midnight. Mostly cloudy, with a low around 28.
Thursday
A chance of rain and snow, mainly before noon. Mostly cloudy, with a high near 38. Chance of precipitation is 30%.
Thursday Night
A slight chance of rain and snow. Mostly cloudy, with a low around 18. Chance of precipitation is 20%.
Friday
Mostly sunny, with a high near 26.
Friday Night
Mostly cloudy, with a low around 6.
Saturday
Partly sunny, with a high near 22.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Caseyville IL
 38.66°N 90.06°W (Elev. 433 ft)
Last Update:
2:41 am CST Dec 7, 2025
Forecast Valid:
3am CST Dec 7, 2025-6pm CST Dec 13, 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