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

80°F

27°C

Humidity 39%
Wind Speed Vrbl 7 mph
Barometer 30.11 in (1019.3 mb)
Dewpoint 53°F (12°C)
Visibility 10.00 mi
Heat Index80°F (27°C)
Last update 1 Sep 2:53 pm CDT
Extended Forecast for

Caseyville IL

  • Tonight

    Tonight: Mostly cloudy, with a low around 59. Northeast wind around 6 mph becoming calm in the evening.

    Low: 59 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 81. Calm wind becoming north around 5 mph in the afternoon.

    High: 81 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 60. Light and variable wind.

    Low: 60 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 87. Calm wind becoming west 5 to 9 mph in the morning.

    High: 87 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Showers likely and possibly a thunderstorm before 1am, then a chance of showers. Mostly cloudy, with a low around 56. West wind 7 to 9 mph becoming north after midnight. Chance of precipitation is 70%.

    Low: 56 °F

    Showers
    Likely

  • Thursday

    Thursday: Mostly sunny, with a high near 74.

    High: 74 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 55.

    Low: 55 °F

    Mostly Clear

  • Friday

    Friday: Mostly sunny, with a high near 80.

    High: 80 °F

    Mostly Sunny

  • Friday Night

    Friday Night: A 20 percent chance of showers before 1am. Partly cloudy, with a low around 51.

    Low: 51 °F

    Slight Chance
    Showers

Detailed Forecast

Tonight
Mostly cloudy, with a low around 59. Northeast wind around 6 mph becoming calm in the evening.
Tuesday
Mostly sunny, with a high near 81. Calm wind becoming north around 5 mph in the afternoon.
Tuesday Night
Mostly clear, with a low around 60. Light and variable wind.
Wednesday
Sunny, with a high near 87. Calm wind becoming west 5 to 9 mph in the morning.
Wednesday Night
Showers likely and possibly a thunderstorm before 1am, then a chance of showers. Mostly cloudy, with a low around 56. West wind 7 to 9 mph becoming north after midnight. Chance of precipitation is 70%.
Thursday
Mostly sunny, with a high near 74.
Thursday Night
Mostly clear, with a low around 55.
Friday
Mostly sunny, with a high near 80.
Friday Night
A 20 percent chance of showers before 1am. Partly cloudy, with a low around 51.
Saturday
Sunny, with a high near 76.
Saturday Night
Mostly clear, with a low around 51.
Sunday
Sunny, with a high near 77.
Sunday Night
Mostly clear, with a low around 52.
Monday
Mostly sunny, with a high near 78.
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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:
2:16 pm CDT Sep 1, 2025
Forecast Valid:
3pm CDT Sep 1, 2025-6pm CDT Sep 8, 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