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

26°F

-3°C

Humidity 75%
Wind Speed Calm
Barometer 30.48 in (1032.5 mb)
Dewpoint 19°F (-7°C)
Visibility 8.00 mi
Last update 11 Jan 8:53 pm CST
Extended Forecast for

Caseyville IL

  • Tonight

    Tonight: Clear, with a low around 26. South wind 5 to 7 mph.

    Low: 26 °F

    Clear

  • Monday

    Monday: Sunny, with a high near 52. Southwest wind 6 to 10 mph.

    High: 52 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 37. Southwest wind 5 to 8 mph.

    Low: 37 °F

    Mostly Clear

  • Tuesday

    Tuesday: Partly sunny, with a high near 60. Southwest wind 8 to 14 mph, with gusts as high as 22 mph.

    High: 60 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: A 20 percent chance of rain before midnight. Mostly cloudy, with a low around 39. West wind 9 to 11 mph, with gusts as high as 20 mph.

    Low: 39 °F

    Slight Chance
    Rain then
    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly cloudy, with a temperature rising to near 42 by 9am, then falling to around 35 during the remainder of the day. Breezy.

    High: 42 °F⇓

    Mostly Cloudy
    then Mostly
    Cloudy and
    Breezy

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 19. Blustery.

    Low: 19 °F

    Mostly Cloudy
    and Blustery
    then Partly
    Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 34.

    High: 34 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 28.

    Low: 28 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Clear, with a low around 26. South wind 5 to 7 mph.
Monday
Sunny, with a high near 52. Southwest wind 6 to 10 mph.
Monday Night
Mostly clear, with a low around 37. Southwest wind 5 to 8 mph.
Tuesday
Partly sunny, with a high near 60. Southwest wind 8 to 14 mph, with gusts as high as 22 mph.
Tuesday Night
A 20 percent chance of rain before midnight. Mostly cloudy, with a low around 39. West wind 9 to 11 mph, with gusts as high as 20 mph.
Wednesday
Mostly cloudy, with a temperature rising to near 42 by 9am, then falling to around 35 during the remainder of the day. Breezy.
Wednesday Night
Mostly cloudy, with a low around 19. Blustery.
Thursday
Mostly sunny, with a high near 34.
Thursday Night
Mostly cloudy, with a low around 28.
Friday
Partly sunny, with a high near 43.
Friday Night
Mostly cloudy, with a low around 24.
Saturday
Mostly cloudy, with a high near 32.
Saturday Night
Partly cloudy, with a low around 16.
Sunday
Mostly sunny, with a high near 33.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Caseyville IL
 38.61°N 90.03°W (Elev. 502 ft)
Last Update:
7:47 pm CST Jan 11, 2026
Forecast Valid:
9pm CST Jan 11, 2026-6pm CST Jan 18, 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