National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce
Current conditions at

St. Louis Regional Airport (KALN)

Lat: 38.89°NLon: 90.03°WElev: 518ft.

Fair

81°F

27°C

Humidity 66%
Wind Speed S 8 mph
Barometer 29.91 in
Dewpoint 68°F (20°C)
Visibility 10.00 mi
Heat Index84°F (29°C)
Last update 13 Oct 9:50 pm CDT
Extended Forecast for

Carlinville IL

  • Tonight

    Tonight: Showers and thunderstorms likely, mainly after 5am. Increasing clouds, with a low around 68. South wind 6 to 8 mph becoming northwest after midnight. Chance of precipitation is 60%.

    Low: 68 °F

    Clear then
    T-storms
    Likely

  • Wednesday

    Wednesday: Showers and thunderstorms before 9am, then showers likely and possibly a thunderstorm between 9am and noon, then a chance of showers and thunderstorms after noon. High near 77. North wind 5 to 7 mph. Chance of precipitation is 80%.

    High: 77 °F

    T-storms then
    Chance
    T-storms

  • Wednesday Night

    Wednesday Night: A slight chance of showers and thunderstorms, then showers likely after 2am. Cloudy, with a low around 62. East wind 7 to 9 mph. Chance of precipitation is 60%.

    Low: 62 °F

    Slight Chance
    T-storms then
    Showers
    Likely

  • Thursday

    Thursday: Showers and possibly a thunderstorm. High near 80. Light and variable wind becoming southwest 5 to 9 mph in the morning. Chance of precipitation is 100%.

    High: 80 °F

    Showers

  • Thursday Night

    Thursday Night: A 50 percent chance of showers and thunderstorms before 1am. Mostly cloudy, with a low around 45. Northwest wind 7 to 16 mph, with gusts as high as 25 mph.

    Low: 45 °F

    Chance
    T-storms then
    Chance
    Showers

  • Friday

    Friday: Mostly sunny, with a high near 60. Breezy.

    High: 60 °F

    Mostly Sunny
    and Breezy

  • Friday Night

    Friday Night: Mostly clear, with a low around 33.

    Low: 33 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 63.

    High: 63 °F

    Sunny

  • Saturday Night

    Saturday Night: Clear, with a low around 35.

    Low: 35 °F

    Clear

Detailed Forecast

Tonight
Showers and thunderstorms likely, mainly after 5am. Increasing clouds, with a low around 68. South wind 6 to 8 mph becoming northwest after midnight. Chance of precipitation is 60%.
Wednesday
Showers and thunderstorms before 9am, then showers likely and possibly a thunderstorm between 9am and noon, then a chance of showers and thunderstorms after noon. High near 77. North wind 5 to 7 mph. Chance of precipitation is 80%.
Wednesday Night
A slight chance of showers and thunderstorms, then showers likely after 2am. Cloudy, with a low around 62. East wind 7 to 9 mph. Chance of precipitation is 60%.
Thursday
Showers and possibly a thunderstorm. High near 80. Light and variable wind becoming southwest 5 to 9 mph in the morning. Chance of precipitation is 100%.
Thursday Night
A 50 percent chance of showers and thunderstorms before 1am. Mostly cloudy, with a low around 45. Northwest wind 7 to 16 mph, with gusts as high as 25 mph.
Friday
Mostly sunny, with a high near 60. Breezy.
Friday Night
Mostly clear, with a low around 33.
Saturday
Sunny, with a high near 63.
Saturday Night
Clear, with a low around 35.
Sunday
Sunny, with a high near 69.
Sunday Night
Partly cloudy, with a low around 43.
Monday
Mostly sunny, with a high near 71.
Monday Night
Partly cloudy, with a low around 47.
Tuesday
Mostly sunny, with a high near 78.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Carlinville IL
 39.27°N 89.89°W (Elev. 614 ft)
Last Update:
9:06 pm CDT Oct 13, 2026
Forecast Valid:
10pm CDT Oct 13, 2026-6pm CDT Oct 20, 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