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

27°F

-3°C

Humidity 70%
Wind Speed Calm
Barometer 30.37 in
Dewpoint 18°F (-8°C)
Visibility 10.00 mi
Last update 12 Jan 3:35 am CST
Extended Forecast for

Carlinville IL

  • Overnight

    Overnight: Clear, with a low around 24. South wind 3 to 7 mph. Winds could gust as high as 20 mph.

    Low: 24 °F

    Clear

  • Monday

    Monday: Sunny, with a high near 49. Southwest wind 7 to 11 mph, with gusts as high as 21 mph.

    High: 49 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 33. Southwest wind 7 to 10 mph.

    Low: 33 °F

    Mostly Clear

  • Tuesday

    Tuesday: Increasing clouds, with a high near 56. West wind 11 to 17 mph, with gusts as high as 26 mph.

    High: 56 °F

    Increasing
    Clouds

  • Tuesday Night

    Tuesday Night: A 20 percent chance of showers before midnight. Mostly cloudy, with a low around 35. West wind 8 to 11 mph.

    Low: 35 °F

    Slight Chance
    Showers then
    Mostly Cloudy

  • Wednesday

    Wednesday: A slight chance of rain showers between noon and 3pm, then a slight chance of snow showers after 3pm. Mostly cloudy, with a temperature falling to around 29 by 5pm. Breezy. Chance of precipitation is 20%.

    High: 40 °F⇓

    Breezy.
    Mostly Cloudy
    then Slight
    Chance
    Rain/Snow

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 15.

    Low: 15 °F

    Partly Cloudy

  • Thursday

    Thursday: Sunny, with a high near 28.

    High: 28 °F

    Sunny

  • Thursday Night

    Thursday Night: A 20 percent chance of snow showers before midnight. Mostly cloudy, with a low around 23.

    Low: 23 °F

    Slight Chance
    Snow Showers
    then Mostly
    Cloudy

Detailed Forecast

Overnight
Clear, with a low around 24. South wind 3 to 7 mph. Winds could gust as high as 20 mph.
Monday
Sunny, with a high near 49. Southwest wind 7 to 11 mph, with gusts as high as 21 mph.
Monday Night
Mostly clear, with a low around 33. Southwest wind 7 to 10 mph.
Tuesday
Increasing clouds, with a high near 56. West wind 11 to 17 mph, with gusts as high as 26 mph.
Tuesday Night
A 20 percent chance of showers before midnight. Mostly cloudy, with a low around 35. West wind 8 to 11 mph.
Wednesday
A slight chance of rain showers between noon and 3pm, then a slight chance of snow showers after 3pm. Mostly cloudy, with a temperature falling to around 29 by 5pm. Breezy. Chance of precipitation is 20%.
Wednesday Night
Partly cloudy, with a low around 15.
Thursday
Sunny, with a high near 28.
Thursday Night
A 20 percent chance of snow showers before midnight. Mostly cloudy, with a low around 23.
Friday
A 20 percent chance of snow showers after noon. Mostly cloudy, with a high near 39.
Friday Night
Mostly cloudy, with a low around 16.
Saturday
Mostly cloudy, with a high near 26.
Saturday Night
Mostly cloudy, with a low around 7.
Sunday
Mostly sunny, with a high near 24.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Carlinville IL
 39.27°N 89.86°W (Elev. 623 ft)
Last Update:
3:41 am CST Jan 12, 2026
Forecast Valid:
3am CST Jan 12, 2026-6pm CST Jan 18, 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