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

86°F

30°C

Humidity 55%
Wind Speed S 9 mph
Barometer 29.92 in
Dewpoint 68°F (20°C)
Visibility 10.00 mi
Heat Index89°F (32°C)
Last update 13 Oct 12:50 pm CDT
Extended Forecast for

Carlinville IL

  • This Afternoon

    This Afternoon: Mostly sunny, with a high near 93. Southwest wind around 8 mph.

    High: 93 °F

    Mostly Sunny

  • Tonight

    Tonight: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 5am. Increasing clouds, with a low around 68. Light and variable wind becoming south around 5 mph. Chance of precipitation is 60%.

    Low: 68 °F

    Mostly Clear
    then Showers
    Likely

  • Wednesday

    Wednesday: Showers and possibly a thunderstorm, mainly before noon, then a chance of showers and thunderstorms after noon. Patchy fog between 9am and 11am. High near 77. Light north wind. Chance of precipitation is 80%.

    High: 77 °F

    Showers and
    Patchy Fog
    then Chance
    T-storms

  • Wednesday Night

    Wednesday Night: A slight chance of showers and thunderstorms, then showers likely after 2am. Mostly cloudy, with a low around 62. Light northeast wind. 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.

    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 35.

    Low: 35 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 63.

    High: 63 °F

    Sunny

Detailed Forecast

This Afternoon
Mostly sunny, with a high near 93. Southwest wind around 8 mph.
Tonight
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 5am. Increasing clouds, with a low around 68. Light and variable wind becoming south around 5 mph. Chance of precipitation is 60%.
Wednesday
Showers and possibly a thunderstorm, mainly before noon, then a chance of showers and thunderstorms after noon. Patchy fog between 9am and 11am. High near 77. Light north wind. Chance of precipitation is 80%.
Wednesday Night
A slight chance of showers and thunderstorms, then showers likely after 2am. Mostly cloudy, with a low around 62. Light northeast wind. 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.
Friday
Mostly sunny, with a high near 60. Breezy.
Friday Night
Mostly clear, with a low around 35.
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 74.
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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:
11:26 am CDT Oct 13, 2026
Forecast Valid:
1pm CDT Oct 13, 2026-6pm CDT Oct 19, 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