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

68°F

20°C

Humidity 38%
Wind Speed S 15 mph
Barometer 30.03 in
Dewpoint 41°F (5°C)
Visibility 10.00 mi
Last update 29 Mar 6:50 pm CDT
Extended Forecast for

Carlinville IL

  • Tonight

    Tonight: Mostly cloudy, with a low around 53. South wind 10 to 13 mph, with gusts as high as 24 mph.

    Low: 53 °F

    Mostly Cloudy

  • Monday

    Monday: Partly sunny, then gradually becoming sunny, with a high near 81. Southwest wind 11 to 18 mph, with gusts as high as 26 mph.

    High: 81 °F

    Becoming
    Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 61. South wind 13 to 15 mph, with gusts as high as 26 mph.

    Low: 61 °F

    Partly Cloudy

  • Tuesday

    Tuesday: A slight chance of rain, then a chance of rain and thunderstorms after 10am. Partly sunny, with a high near 83. Breezy, with a south wind 16 to 23 mph, with gusts as high as 31 mph. Chance of precipitation is 50%.

    High: 83 °F

    Breezy.
    Slight Chance
    T-storms then
    Chance
    T-storms

  • Tuesday Night

    Tuesday Night: Rain and possibly a thunderstorm. Low around 50. Southwest wind around 11 mph becoming north after midnight. Winds could gust as high as 21 mph. Chance of precipitation is 90%.

    Low: 50 °F

    Rain

  • Wednesday

    Wednesday: Rain and possibly a thunderstorm. High near 62. Chance of precipitation is 80%.

    High: 62 °F

    Rain

  • Wednesday Night

    Wednesday Night: Rain and possibly a thunderstorm. Low around 47. Chance of precipitation is 90%.

    Low: 47 °F

    Rain

  • Thursday

    Thursday: Rain. High near 64. Chance of precipitation is 80%.

    High: 64 °F

    Rain

  • Thursday Night

    Thursday Night: Rain likely, mainly before 1am. Mostly cloudy, with a low around 45. Chance of precipitation is 60%.

    Low: 45 °F

    Rain Likely

Detailed Forecast

Tonight
Mostly cloudy, with a low around 53. South wind 10 to 13 mph, with gusts as high as 24 mph.
Monday
Partly sunny, then gradually becoming sunny, with a high near 81. Southwest wind 11 to 18 mph, with gusts as high as 26 mph.
Monday Night
Partly cloudy, with a low around 61. South wind 13 to 15 mph, with gusts as high as 26 mph.
Tuesday
A slight chance of rain, then a chance of rain and thunderstorms after 10am. Partly sunny, with a high near 83. Breezy, with a south wind 16 to 23 mph, with gusts as high as 31 mph. Chance of precipitation is 50%.
Tuesday Night
Rain and possibly a thunderstorm. Low around 50. Southwest wind around 11 mph becoming north after midnight. Winds could gust as high as 21 mph. Chance of precipitation is 90%.
Wednesday
Rain and possibly a thunderstorm. High near 62. Chance of precipitation is 80%.
Wednesday Night
Rain and possibly a thunderstorm. Low around 47. Chance of precipitation is 90%.
Thursday
Rain. High near 64. Chance of precipitation is 80%.
Thursday Night
Rain likely, mainly before 1am. Mostly cloudy, with a low around 45. Chance of precipitation is 60%.
Friday
A 40 percent chance of rain. Mostly cloudy, with a high near 71.
Friday Night
A 50 percent chance of rain. Mostly cloudy, with a low around 54.
Saturday
Rain likely and possibly a thunderstorm. Mostly cloudy, with a high near 69. Chance of precipitation is 70%.
Saturday Night
Rain likely and possibly a thunderstorm. Mostly cloudy, with a low around 44. Chance of precipitation is 60%.
Sunday
A 30 percent chance of rain. Mostly cloudy, with a high near 59.
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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:
6:01 pm CDT Mar 29, 2026
Forecast Valid:
7pm CDT Mar 29, 2026-6pm CDT Apr 5, 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