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

59°F

15°C

Humidity 29%
Wind Speed W 20 mph
Barometer 29.94 in
Dewpoint 27°F (-3°C)
Visibility 10.00 mi
Last update 13 Mar 1:50 pm CDT
Extended Forecast for

Carlinville IL

  • This Afternoon

    This Afternoon: Partly sunny, with a high near 56. Breezy, with a west wind 16 to 20 mph, with gusts as high as 28 mph.

    High: 56 °F

    Partly Sunny
    and Breezy

  • Tonight

    Tonight: Partly cloudy, with a low around 33. Northwest wind 5 to 8 mph becoming light and variable.

    Low: 33 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 58. East wind 7 to 15 mph, with gusts as high as 22 mph.

    High: 58 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 50. Southeast wind 11 to 16 mph, with gusts as high as 25 mph.

    Low: 50 °F

    Mostly Cloudy

  • Sunday

    Sunday: Rain, mainly between 1pm and 4pm, then showers and possibly a thunderstorm after 4pm. High near 67. Breezy, with a south wind 21 to 26 mph, with gusts as high as 41 mph. Chance of precipitation is 90%.

    High: 67 °F

    Breezy.
    Chance Rain
    then Showers

  • Sunday Night

    Sunday Night: Rain before 10pm, then snow, possibly mixed with rain between 10pm and 1am, then snow likely after 1am. Some thunder is also possible. Low around 19. Breezy. Chance of precipitation is 90%. New snow accumulation of around an inch possible.

    Low: 19 °F

    Rain/Snow and
    Breezy

  • Monday

    Monday: A 40 percent chance of snow before 1pm. Mostly cloudy, with a high near 25. Blustery.

    High: 25 °F

    Chance Snow
    and Blustery

  • Monday Night

    Monday Night: Partly cloudy, with a low around 9. Blustery.

    Low: 9 °F

    Partly Cloudy
    and Blustery
    then Mostly
    Clear

  • Tuesday

    Tuesday: Sunny, with a high near 32.

    High: 32 °F

    Sunny

Detailed Forecast

This Afternoon
Partly sunny, with a high near 56. Breezy, with a west wind 16 to 20 mph, with gusts as high as 28 mph.
Tonight
Partly cloudy, with a low around 33. Northwest wind 5 to 8 mph becoming light and variable.
Saturday
Mostly sunny, with a high near 58. East wind 7 to 15 mph, with gusts as high as 22 mph.
Saturday Night
Mostly cloudy, with a low around 50. Southeast wind 11 to 16 mph, with gusts as high as 25 mph.
Sunday
Rain, mainly between 1pm and 4pm, then showers and possibly a thunderstorm after 4pm. High near 67. Breezy, with a south wind 21 to 26 mph, with gusts as high as 41 mph. Chance of precipitation is 90%.
Sunday Night
Rain before 10pm, then snow, possibly mixed with rain between 10pm and 1am, then snow likely after 1am. Some thunder is also possible. Low around 19. Breezy. Chance of precipitation is 90%. New snow accumulation of around an inch possible.
Monday
A 40 percent chance of snow before 1pm. Mostly cloudy, with a high near 25. Blustery.
Monday Night
Partly cloudy, with a low around 9. Blustery.
Tuesday
Sunny, with a high near 32.
Tuesday Night
A chance of snow before 1am, then a chance of rain and snow. Mostly cloudy, with a low around 24. Chance of precipitation is 40%.
Wednesday
Mostly sunny, with a high near 58.
Wednesday Night
Mostly clear, with a low around 35.
Thursday
Mostly sunny, with a high near 64.
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ABOUT THIS FORECAST

 
Point Forecast:
Carlinville IL
 39.27°N 89.89°W (Elev. 614 ft)
Last Update:
1:21 pm CDT Mar 13, 2026
Forecast Valid:
2pm CDT Mar 13, 2026-6pm CDT Mar 19, 2026
 
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Additional Resources

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Chance of Precipitation