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.

Overcast

63°F

17°C

Humidity 85%
Wind Speed N 7 mph
Barometer 29.91 in
Dewpoint 58°F (14°C)
Visibility 10.00 mi
Last update 22 Jun 6:15 am CDT
Extended Forecast for

Carlinville IL

  • Today

    Today: Mostly cloudy, with a high near 73. North wind 9 to 11 mph, with gusts as high as 20 mph.

    High: 73 °F

    Mostly Cloudy

  • Tonight

    Tonight: Mostly cloudy during the early evening, then gradual clearing, with a low around 55. North wind 3 to 6 mph.

    Low: 55 °F

    Gradual
    Clearing

  • Tuesday

    Tuesday: Sunny, with a high near 78. Light east wind.

    High: 78 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 59. Light east wind.

    Low: 59 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 80. South wind around 6 mph.

    High: 80 °F

    Chance
    Showers then
    Chance
    T-storms

  • Wednesday Night

    Wednesday Night: A 20 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 62.

    Low: 62 °F

    Slight Chance
    T-storms

  • Thursday

    Thursday: A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 81.

    High: 81 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

  • Thursday Night

    Thursday Night: A chance of showers and thunderstorms. Partly cloudy, with a low around 60. Chance of precipitation is 30%.

    Low: 60 °F

    Chance
    Showers

  • Friday

    Friday: A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 80.

    High: 80 °F

    Chance
    Showers then
    Chance
    T-storms

Detailed Forecast

Today
Mostly cloudy, with a high near 73. North wind 9 to 11 mph, with gusts as high as 20 mph.
Tonight
Mostly cloudy during the early evening, then gradual clearing, with a low around 55. North wind 3 to 6 mph.
Tuesday
Sunny, with a high near 78. Light east wind.
Tuesday Night
Mostly cloudy, with a low around 59. Light east wind.
Wednesday
A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 80. South wind around 6 mph.
Wednesday Night
A 20 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 62.
Thursday
A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 81.
Thursday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 60. Chance of precipitation is 30%.
Friday
A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 80.
Friday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 64. Chance of precipitation is 60%.
Saturday
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 84.
Saturday Night
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 69.
Sunday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 90.
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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:
4:56 am CDT Jun 22, 2026
Forecast Valid:
6am CDT Jun 22, 2026-6pm CDT Jun 28, 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