National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

St. Louis Regional Airport (KALN)

Lat: 38.89°NLon: 90.03°WElev: 518ft.

Fair

77°F

25°C

Humidity 57%
Wind Speed NW 10 mph
Barometer 30.03 in
Dewpoint 61°F (16°C)
Visibility 10.00 mi
Heat Index79°F (26°C)
Last update 20 Jun 8:50 am CDT
Extended Forecast for

Carlinville IL

Flood Watch June 21, 07:00am until June 22, 01:00am
Click here for hazard details and duration
Flood Watch

  • Today

    Today: Mostly sunny, with a high near 82. Northwest wind 3 to 5 mph.

    High: 82 °F

    Mostly Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 63. Light and variable wind becoming east around 5 mph after midnight.

    Low: 63 °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 90%.

    High: 79 °F

    Heavy Rain

  • Sunday Night

    Sunday Night: Showers and thunderstorms, mainly before 1am. Low around 59. Southwest wind 7 to 10 mph becoming north after midnight. Chance of precipitation is 80%.

    Low: 59 °F

    T-storms

  • Monday

    Monday: A 20 percent chance of showers and thunderstorms before 1pm. Partly sunny, with a high near 75. North wind 8 to 10 mph.

    High: 75 °F

    Slight Chance
    T-storms

  • Monday Night

    Monday Night: Mostly clear, with a low around 55.

    Low: 55 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 78.

    High: 78 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 58.

    Low: 58 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 80.

    High: 80 °F

    Sunny

Detailed Forecast

Today
Mostly sunny, with a high near 82. Northwest wind 3 to 5 mph.
Tonight
Partly cloudy, with a low around 63. Light and variable wind becoming east around 5 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 90%.
Sunday Night
Showers and thunderstorms, mainly before 1am. Low around 59. Southwest wind 7 to 10 mph becoming north after midnight. Chance of precipitation is 80%.
Monday
A 20 percent chance of showers and thunderstorms before 1pm. Partly sunny, with a high near 75. North wind 8 to 10 mph.
Monday Night
Mostly clear, with a low around 55.
Tuesday
Sunny, with a high near 78.
Tuesday Night
Mostly clear, with a low around 58.
Wednesday
Sunny, with a high near 80.
Wednesday Night
Mostly clear, with a low around 58.
Thursday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 79.
Thursday Night
A 20 percent chance of showers. Partly cloudy, with a low around 58.
Friday
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 79.
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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:
5:36 am CDT Jun 20, 2026
Forecast Valid:
9am 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