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

34°F

1°C

Humidity 70%
Wind Speed S 8 mph
Barometer 29.92 in
Dewpoint 25°F (-4°C)
Visibility 10.00 mi
Wind Chill27°F (-3°C)
Last update 5 Feb 4:45 pm CST
Extended Forecast for

Bethalto IL

  • Tonight

    Tonight: Partly cloudy, with a low around 28. Southeast wind 5 to 8 mph becoming west after midnight.

    Low: 28 °F

    Partly Cloudy

  • Friday

    Friday: Sunny through mid morning, then becoming mostly cloudy, with a high near 46. Breezy, with a southwest wind 10 to 15 mph becoming northwest 16 to 21 mph in the morning. Winds could gust as high as 32 mph.

    High: 46 °F

    Mostly Cloudy
    and Breezy

  • Friday Night

    Friday Night: Partly cloudy, with a low around 21. Northwest wind 6 to 16 mph, with gusts as high as 28 mph.

    Low: 21 °F

    Partly Cloudy

  • Saturday

    Saturday: Sunny, with a high near 34. Northeast wind around 6 mph becoming southeast in the afternoon.

    High: 34 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 24. Southeast wind 6 to 10 mph.

    Low: 24 °F

    Mostly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 50.

    High: 50 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 28.

    Low: 28 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 55.

    High: 55 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 38.

    Low: 38 °F

    Mostly Clear

Detailed Forecast

Tonight
Partly cloudy, with a low around 28. Southeast wind 5 to 8 mph becoming west after midnight.
Friday
Sunny through mid morning, then becoming mostly cloudy, with a high near 46. Breezy, with a southwest wind 10 to 15 mph becoming northwest 16 to 21 mph in the morning. Winds could gust as high as 32 mph.
Friday Night
Partly cloudy, with a low around 21. Northwest wind 6 to 16 mph, with gusts as high as 28 mph.
Saturday
Sunny, with a high near 34. Northeast wind around 6 mph becoming southeast in the afternoon.
Saturday Night
Mostly cloudy, with a low around 24. Southeast wind 6 to 10 mph.
Sunday
Mostly sunny, with a high near 50.
Sunday Night
Mostly clear, with a low around 28.
Monday
Sunny, with a high near 55.
Monday Night
Mostly clear, with a low around 38.
Tuesday
A 20 percent chance of rain after noon. Mostly sunny, with a high near 63.
Tuesday Night
A 40 percent chance of rain. Cloudy, with a low around 41.
Wednesday
A 30 percent chance of rain. Mostly cloudy, with a high near 54.
Wednesday Night
A 30 percent chance of rain. Mostly cloudy, with a low around 35.
Thursday
A 30 percent chance of rain. Mostly cloudy, with a high near 48.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Bethalto IL
 38.88°N 90.02°W (Elev. 499 ft)
Last Update:
4:41 pm CST Feb 5, 2026
Forecast Valid:
5pm CST Feb 5, 2026-6pm CST Feb 12, 2026
 
Forecast Discussion
 
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Additional Resources

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation