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

68°F

20°C

Humidity 94%
Wind Speed Calm
Barometer 30.06 in
Dewpoint 66°F (19°C)
Visibility 7.00 mi
Last update 15 Oct 1:35 am CDT
Extended Forecast for

Carlinville IL

  • Overnight

    Overnight: A 20 percent chance of showers after 4am. Mostly cloudy, with a low around 63. Light east wind.

    Low: 63 °F

    Slight Chance
    Showers

  • Thursday

    Thursday: Showers and possibly a thunderstorm, mainly before 1pm, then a chance of showers and thunderstorms after 1pm. Patchy fog between 10am and 11am. High near 78. Light and variable wind becoming southwest 5 to 10 mph in the morning. Chance of precipitation is 90%.

    High: 78 °F

    Showers and
    Patchy Fog

  • Thursday Night

    Thursday Night: Showers and thunderstorms likely before 1am, then isolated showers between 1am and 3am. Increasing clouds, with a low around 43. Southwest wind 10 to 15 mph becoming northwest after midnight. Winds could gust as high as 24 mph. Chance of precipitation is 60%.

    Low: 43 °F

    Showers
    Likely

  • Friday

    Friday: Isolated showers after 3pm. Partly sunny, with a high near 56. Northwest wind 16 to 18 mph, with gusts as high as 28 mph. Chance of precipitation is 20%.

    High: 56 °F

    Partly Sunny
    then Isolated
    Showers

  • Friday Night

    Friday Night: Partly cloudy, with a low around 34. North wind 6 to 15 mph, with gusts as high as 22 mph.

    Low: 34 °F

    Partly Cloudy

  • Saturday

    Saturday: Sunny, with a high near 60.

    High: 60 °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 36.

    Low: 36 °F

    Mostly Clear

Detailed Forecast

Overnight
A 20 percent chance of showers after 4am. Mostly cloudy, with a low around 63. Light east wind.
Thursday
Showers and possibly a thunderstorm, mainly before 1pm, then a chance of showers and thunderstorms after 1pm. Patchy fog between 10am and 11am. High near 78. Light and variable wind becoming southwest 5 to 10 mph in the morning. Chance of precipitation is 90%.
Thursday Night
Showers and thunderstorms likely before 1am, then isolated showers between 1am and 3am. Increasing clouds, with a low around 43. Southwest wind 10 to 15 mph becoming northwest after midnight. Winds could gust as high as 24 mph. Chance of precipitation is 60%.
Friday
Isolated showers after 3pm. Partly sunny, with a high near 56. Northwest wind 16 to 18 mph, with gusts as high as 28 mph. Chance of precipitation is 20%.
Friday Night
Partly cloudy, with a low around 34. North wind 6 to 15 mph, with gusts as high as 22 mph.
Saturday
Sunny, with a high near 60.
Saturday Night
Clear, with a low around 34.
Sunday
Sunny, with a high near 67.
Sunday Night
Mostly clear, with a low around 36.
Monday
Mostly sunny, with a high near 73.
Monday Night
Partly cloudy, with a low around 39.
Tuesday
Mostly sunny, with a high near 74.
Tuesday Night
Mostly clear, with a low around 42.
Wednesday
Sunny, with a high near 77.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Carlinville IL
 39.3°N 89.86°W (Elev. 627 ft)
Last Update:
1:26 am CDT Oct 15, 2026
Forecast Valid:
1am CDT Oct 15, 2026-6pm CDT Oct 21, 2026
 
Forecast Discussion
 
Get as KML Get as XML

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