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

25°F

-4°C

Humidity 54%
Wind Speed Vrbl 5 mph
Barometer 30.44 in
Dewpoint 10°F (-12°C)
Visibility 10.00 mi
Wind Chill19°F (-7°C)
Last update 23 Feb 6:50 pm CST
Extended Forecast for

Carlinville IL

  • Tonight

    Tonight: Mostly clear, with a low around 17. Light and variable wind becoming south 5 to 9 mph after midnight.

    Low: 17 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 51. Breezy, with a southwest wind 11 to 16 mph increasing to 17 to 22 mph in the morning. Winds could gust as high as 38 mph.

    High: 51 °F

    Mostly Cloudy
    and Breezy

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 29. Southwest wind 5 to 11 mph becoming northwest after midnight. Winds could gust as high as 20 mph.

    Low: 29 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 49. Northwest wind around 6 mph becoming northeast in the afternoon.

    High: 49 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Rain likely, mainly after midnight. Mostly cloudy, with a low around 32. East wind 5 to 8 mph. Chance of precipitation is 60%.

    Low: 32 °F

    Rain Likely

  • Thursday

    Thursday: A 20 percent chance of rain before noon. Partly sunny, with a high near 46.

    High: 46 °F

    Slight Chance
    Rain then
    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 28.

    Low: 28 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 60.

    High: 60 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 37.

    Low: 37 °F

    Mostly Clear

Detailed Forecast

Tonight
Mostly clear, with a low around 17. Light and variable wind becoming south 5 to 9 mph after midnight.
Tuesday
Mostly cloudy, with a high near 51. Breezy, with a southwest wind 11 to 16 mph increasing to 17 to 22 mph in the morning. Winds could gust as high as 38 mph.
Tuesday Night
Mostly cloudy, with a low around 29. Southwest wind 5 to 11 mph becoming northwest after midnight. Winds could gust as high as 20 mph.
Wednesday
Mostly sunny, with a high near 49. Northwest wind around 6 mph becoming northeast in the afternoon.
Wednesday Night
Rain likely, mainly after midnight. Mostly cloudy, with a low around 32. East wind 5 to 8 mph. Chance of precipitation is 60%.
Thursday
A 20 percent chance of rain before noon. Partly sunny, with a high near 46.
Thursday Night
Mostly clear, with a low around 28.
Friday
Sunny, with a high near 60.
Friday Night
Mostly clear, with a low around 37.
Saturday
Sunny, with a high near 61.
Saturday Night
Mostly cloudy, with a low around 28.
Sunday
A chance of rain and snow. Mostly cloudy, with a high near 43. Chance of precipitation is 30%.
Sunday Night
A 40 percent chance of rain. Mostly cloudy, with a low around 27.
Monday
A 30 percent chance of rain. Mostly cloudy, with a high near 42.
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 89.89°W (Elev. 614 ft)
Last Update:
2:51 pm CST Feb 23, 2026
Forecast Valid:
7pm CST Feb 23, 2026-6pm CST Mar 2, 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