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.

Mostly Cloudy

59°F

15°C

Humidity 72%
Wind Speed W 6 mph
Barometer 30.05 in
Dewpoint 50°F (10°C)
Visibility 10.00 mi
Last update 28 Apr 11:50 am CDT
Extended Forecast for

Bethalto IL

  • This Afternoon

    This Afternoon: A 30 percent chance of showers and thunderstorms after 4pm. Mostly cloudy, with a high near 68. Northwest wind 5 to 7 mph becoming north.

    High: 68 °F

    Chance
    Showers

  • Tonight

    Tonight: Showers and thunderstorms before 2am, then a slight chance of showers between 2am and 3am. Low around 51. Northeast wind 6 to 8 mph becoming north after midnight. Chance of precipitation is 80%.

    Low: 51 °F

    Showers

  • Wednesday

    Wednesday: Mostly sunny, with a high near 64. Northwest wind 10 to 15 mph.

    High: 64 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 42. North wind 5 to 10 mph becoming light after midnight.

    Low: 42 °F

    Mostly Clear

  • Thursday

    Thursday: Mostly sunny, with a high near 66. Calm wind becoming west 5 to 8 mph in the morning.

    High: 66 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 45.

    Low: 45 °F

    Mostly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 61.

    High: 61 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 40.

    Low: 40 °F

    Mostly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 62.

    High: 62 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
A 30 percent chance of showers and thunderstorms after 4pm. Mostly cloudy, with a high near 68. Northwest wind 5 to 7 mph becoming north.
Tonight
Showers and thunderstorms before 2am, then a slight chance of showers between 2am and 3am. Low around 51. Northeast wind 6 to 8 mph becoming north after midnight. Chance of precipitation is 80%.
Wednesday
Mostly sunny, with a high near 64. Northwest wind 10 to 15 mph.
Wednesday Night
Mostly clear, with a low around 42. North wind 5 to 10 mph becoming light after midnight.
Thursday
Mostly sunny, with a high near 66. Calm wind becoming west 5 to 8 mph in the morning.
Thursday Night
Mostly cloudy, with a low around 45.
Friday
Mostly sunny, with a high near 61.
Friday Night
Mostly cloudy, with a low around 40.
Saturday
Mostly sunny, with a high near 62.
Saturday Night
Mostly clear, with a low around 41.
Sunday
Sunny, with a high near 72.
Sunday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 50.
Monday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 74.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Bethalto IL
 38.88°N 90.02°W (Elev. 499 ft)
Last Update:
11:21 am CDT Apr 28, 2026
Forecast Valid:
12pm CDT Apr 28, 2026-6pm CDT May 4, 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