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

82°F

28°C

Humidity 69%
Wind Speed W 8 mph
Barometer 29.55 in
Dewpoint 71°F (22°C)
Visibility 10.00 mi
Heat Index86°F (30°C)
Last update 17 Jun 10:15 pm CDT
Extended Forecast for

Carlinville IL

  • Tonight

    Tonight: Isolated showers and thunderstorms before midnight. Partly cloudy, with a low around 64. West wind around 7 mph. Chance of precipitation is 20%.

    Low: 64 °F

    Isolated
    T-storms then
    Partly Cloudy

  • Thursday

    Thursday: A slight chance of showers between 11am and 2pm. Increasing clouds, with a high near 75. West wind 6 to 8 mph. Chance of precipitation is 20%.

    High: 75 °F

    Mostly Sunny
    then Slight
    Chance
    Showers

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 55. Northwest wind around 5 mph becoming calm in the evening.

    Low: 55 °F

    Mostly Clear

  • Juneteenth

    Juneteenth: Mostly sunny, with a high near 81. Light northwest wind.

    High: 81 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 61. Calm wind.

    Low: 61 °F

    Partly Cloudy

  • Saturday

    Saturday: Partly sunny, with a high near 83.

    High: 83 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: A 40 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 64.

    Low: 64 °F

    Partly Cloudy
    then Chance
    T-storms

  • Sunday

    Sunday: Showers and possibly a thunderstorm. High near 80. Chance of precipitation is 90%.

    High: 80 °F

    Showers

  • Sunday Night

    Sunday Night: Showers and possibly a thunderstorm before 1am, then a chance of showers. Low around 62. Chance of precipitation is 80%.

    Low: 62 °F

    Showers

Detailed Forecast

Tonight
Isolated showers and thunderstorms before midnight. Partly cloudy, with a low around 64. West wind around 7 mph. Chance of precipitation is 20%.
Thursday
A slight chance of showers between 11am and 2pm. Increasing clouds, with a high near 75. West wind 6 to 8 mph. Chance of precipitation is 20%.
Thursday Night
Mostly clear, with a low around 55. Northwest wind around 5 mph becoming calm in the evening.
Juneteenth
Mostly sunny, with a high near 81. Light northwest wind.
Friday Night
Partly cloudy, with a low around 61. Calm wind.
Saturday
Partly sunny, with a high near 83.
Saturday Night
A 40 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 64.
Sunday
Showers and possibly a thunderstorm. High near 80. Chance of precipitation is 90%.
Sunday Night
Showers and possibly a thunderstorm before 1am, then a chance of showers. Low around 62. Chance of precipitation is 80%.
Monday
Partly sunny, with a high near 77.
Monday Night
Partly cloudy, with a low around 57.
Tuesday
Mostly sunny, with a high near 79.
Tuesday Night
Partly cloudy, with a low around 59.
Wednesday
Mostly sunny, with a high near 81.
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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:
10:31 pm CDT Jun 17, 2026
Forecast Valid:
10pm CDT Jun 17, 2026-6pm CDT Jun 24, 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