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.

Overcast

68°F

20°C

Humidity 94%
Wind Speed Calm
Barometer 30.06 in
Dewpoint 66°F (19°C)
Visibility 7.00 mi
Last update 15 Oct 1:55 am CDT
Extended Forecast for

Bethalto IL

  • Overnight

    Overnight: A 30 percent chance of showers, mainly after 5am. Mostly cloudy, with a low around 66. Light east wind.

    Low: 66 °F

    Chance
    Showers

  • Thursday

    Thursday: Showers and thunderstorms before noon, then showers likely and possibly a thunderstorm between noon and 1pm, then a chance of showers and thunderstorms after 1pm. Patchy fog between 9am and 11am. High near 80. East wind 5 to 11 mph becoming southwest in the afternoon. Chance of precipitation is 80%.

    High: 80 °F

    Showers and
    Patchy Fog

  • Thursday Night

    Thursday Night: Showers and thunderstorms likely before 1am, then scattered showers between 1am and 2am. Increasing clouds, with a low around 46. Southwest wind 11 to 17 mph becoming northwest after midnight. Winds could gust as high as 24 mph. Chance of precipitation is 60%.

    Low: 46 °F

    Showers
    Likely

  • Friday

    Friday: Mostly cloudy through mid morning, then becoming sunny, with a high near 57. Breezy, with a northwest wind 18 to 21 mph, with gusts as high as 30 mph.

    High: 57 °F

    Sunny and
    Breezy

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 38. North wind 9 to 18 mph, with gusts as high as 25 mph.

    Low: 38 °F

    Mostly Cloudy

  • Saturday

    Saturday: Sunny, with a high near 61.

    High: 61 °F

    Sunny

  • Saturday Night

    Saturday Night: Clear, with a low around 37.

    Low: 37 °F

    Clear

  • Sunday

    Sunday: Sunny, with a high near 67.

    High: 67 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 39.

    Low: 39 °F

    Mostly Clear

Detailed Forecast

Overnight
A 30 percent chance of showers, mainly after 5am. Mostly cloudy, with a low around 66. Light east wind.
Thursday
Showers and thunderstorms before noon, then showers likely and possibly a thunderstorm between noon and 1pm, then a chance of showers and thunderstorms after 1pm. Patchy fog between 9am and 11am. High near 80. East wind 5 to 11 mph becoming southwest in the afternoon. Chance of precipitation is 80%.
Thursday Night
Showers and thunderstorms likely before 1am, then scattered showers between 1am and 2am. Increasing clouds, with a low around 46. Southwest wind 11 to 17 mph becoming northwest after midnight. Winds could gust as high as 24 mph. Chance of precipitation is 60%.
Friday
Mostly cloudy through mid morning, then becoming sunny, with a high near 57. Breezy, with a northwest wind 18 to 21 mph, with gusts as high as 30 mph.
Friday Night
Mostly cloudy, with a low around 38. North wind 9 to 18 mph, with gusts as high as 25 mph.
Saturday
Sunny, with a high near 61.
Saturday Night
Clear, with a low around 37.
Sunday
Sunny, with a high near 67.
Sunday Night
Mostly clear, with a low around 39.
Monday
Mostly sunny, with a high near 73.
Monday Night
Partly cloudy, with a low around 41.
Tuesday
Sunny, with a high near 75.
Tuesday Night
Mostly clear, with a low around 44.
Wednesday
Sunny, with a high near 78.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Bethalto IL
 38.9°N 90.08°W (Elev. 486 ft)
Last Update:
1:26 am CDT Oct 15, 2026
Forecast Valid:
2am CDT Oct 15, 2026-6pm CDT Oct 21, 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