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.

Partly Cloudy

75°F

24°C

Humidity 78%
Wind Speed W 7 mph
Barometer 30.05 in
Dewpoint 68°F (20°C)
Visibility 10.00 mi
Last update 14 Oct 4:50 pm CDT
Extended Forecast for

Carlinville IL

  • Tonight

    Tonight: A 30 percent chance of showers and thunderstorms, mainly after 5am. Mostly cloudy, with a low around 63. Light and variable wind.

    Low: 63 °F

    Mostly Cloudy
    then Chance
    Showers

  • Thursday

    Thursday: Showers and thunderstorms before noon, then showers likely and possibly a thunderstorm between noon and 1pm, then a chance of showers and thunderstorms after 1pm. High near 80. Light and variable wind becoming south 5 to 8 mph in the morning. Chance of precipitation is 90%.

    High: 80 °F

    Showers then
    Showers
    Likely

  • Thursday Night

    Thursday Night: A chance of showers and thunderstorms before 2am, then a slight chance of showers between 2am and 3am. Mostly cloudy, with a low around 45. Southwest wind 7 to 15 mph becoming northwest after midnight. Winds could gust as high as 25 mph. Chance of precipitation is 50%.

    Low: 45 °F

    Chance
    Showers

  • Friday

    Friday: A 20 percent chance of showers after 1pm. Mostly cloudy, with a high near 55. Breezy, with a northwest wind 17 to 20 mph, with gusts as high as 29 mph.

    High: 55 °F

    Mostly Cloudy
    then Slight
    Chance
    Showers and
    Breezy

  • Friday Night

    Friday Night: Partly cloudy, with a low around 36. North wind 6 to 14 mph.

    Low: 36 °F

    Partly Cloudy

  • Saturday

    Saturday: Sunny, with a high near 61.

    High: 61 °F

    Sunny

  • Saturday Night

    Saturday Night: Clear, with a low around 34.

    Low: 34 °F

    Clear

  • Sunday

    Sunday: Sunny, with a high near 67.

    High: 67 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 38.

    Low: 38 °F

    Mostly Clear

Detailed Forecast

Tonight
A 30 percent chance of showers and thunderstorms, mainly after 5am. Mostly cloudy, with a low around 63. Light and variable wind.
Thursday
Showers and thunderstorms before noon, then showers likely and possibly a thunderstorm between noon and 1pm, then a chance of showers and thunderstorms after 1pm. High near 80. Light and variable wind becoming south 5 to 8 mph in the morning. Chance of precipitation is 90%.
Thursday Night
A chance of showers and thunderstorms before 2am, then a slight chance of showers between 2am and 3am. Mostly cloudy, with a low around 45. Southwest wind 7 to 15 mph becoming northwest after midnight. Winds could gust as high as 25 mph. Chance of precipitation is 50%.
Friday
A 20 percent chance of showers after 1pm. Mostly cloudy, with a high near 55. Breezy, with a northwest wind 17 to 20 mph, with gusts as high as 29 mph.
Friday Night
Partly cloudy, with a low around 36. North wind 6 to 14 mph.
Saturday
Sunny, with a high near 61.
Saturday Night
Clear, with a low around 34.
Sunday
Sunny, with a high near 67.
Sunday Night
Mostly clear, with a low around 38.
Monday
Mostly sunny, with a high near 73.
Monday Night
Partly cloudy, with a low around 41.
Tuesday
Mostly sunny, with a high near 75.
Tuesday Night
Mostly clear, with a low around 47.
Wednesday
Sunny, with a high near 79.
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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:
4:46 pm CDT Oct 14, 2026
Forecast Valid:
5pm CDT Oct 14, 2026-6pm CDT Oct 21, 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