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

67°F

19°C

Humidity 88%
Wind Speed Calm
Barometer 30.02 in
Dewpoint 64°F (18°C)
Visibility 10.00 mi
Last update 20 Jun 12:35 am CDT
Extended Forecast for

3 Miles SE Carlinville IL

  • Overnight

    Overnight: Mostly cloudy, with a low around 65. Light southwest wind.

    Low: 65 °F

    Mostly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 82. Light northwest wind.

    High: 82 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 62. Calm wind becoming east around 6 mph after midnight.

    Low: 62 °F

    Partly Cloudy

  • Sunday

    Sunday: Showers and thunderstorms, mainly after 10am. Some of the storms could produce heavy rainfall. High near 79. East wind 8 to 14 mph becoming south in the afternoon. Winds could gust as high as 24 mph. Chance of precipitation is 100%.

    High: 79 °F

    Heavy Rain

  • Sunday Night

    Sunday Night: Showers and thunderstorms, mainly before 1am. Low around 62. Southwest wind around 10 mph becoming northwest after midnight. Chance of precipitation is 80%.

    Low: 62 °F

    T-storms

  • Monday

    Monday: A 20 percent chance of showers and thunderstorms before 1pm. Partly sunny, with a high near 74.

    High: 74 °F

    Slight Chance
    T-storms

  • Monday Night

    Monday Night: Partly cloudy, with a low around 56.

    Low: 56 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 77.

    High: 77 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 58.

    Low: 58 °F

    Partly Cloudy

Detailed Forecast

Overnight
Mostly cloudy, with a low around 65. Light southwest wind.
Saturday
Mostly sunny, with a high near 82. Light northwest wind.
Saturday Night
Partly cloudy, with a low around 62. Calm wind becoming east around 6 mph after midnight.
Sunday
Showers and thunderstorms, mainly after 10am. Some of the storms could produce heavy rainfall. High near 79. East wind 8 to 14 mph becoming south in the afternoon. Winds could gust as high as 24 mph. Chance of precipitation is 100%.
Sunday Night
Showers and thunderstorms, mainly before 1am. Low around 62. Southwest wind around 10 mph becoming northwest after midnight. Chance of precipitation is 80%.
Monday
A 20 percent chance of showers and thunderstorms before 1pm. Partly sunny, with a high near 74.
Monday Night
Partly cloudy, with a low around 56.
Tuesday
Mostly sunny, with a high near 77.
Tuesday Night
Partly cloudy, with a low around 58.
Wednesday
Sunny, with a high near 79.
Wednesday Night
Mostly clear, with a low around 58.
Thursday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 78.
Thursday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 58.
Friday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 80.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
3 Miles SE Carlinville IL
 39.25°N 89.83°W (Elev. 650 ft)
Last Update:
11:56 pm CDT Jun 19, 2026
Forecast Valid:
12am CDT Jun 20, 2026-6pm CDT Jun 26, 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