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

43°F

6°C

Humidity 66%
Wind Speed N 15 G 22 mph
Barometer 30.23 in
Dewpoint 32°F (0°C)
Visibility 10.00 mi
Wind Chill36°F (2°C)
Last update 11 Mar 8:45 pm CDT
Extended Forecast for

Bethalto IL

  • Tonight

    Tonight: Mostly cloudy, then gradually becoming clear, with a low around 31. Northwest wind 13 to 18 mph decreasing to 7 to 12 mph after midnight. Winds could gust as high as 28 mph.

    Low: 31 °F

    Decreasing
    Clouds

  • Thursday

    Thursday: Sunny, with a high near 53. Light west wind becoming southwest 6 to 11 mph in the morning.

    High: 53 °F

    Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 43. Breezy, with a south wind 13 to 20 mph, with gusts as high as 31 mph.

    Low: 43 °F

    Partly Cloudy
    then Partly
    Cloudy and
    Breezy

  • Friday

    Friday: Partly sunny, with a high near 60. Northwest wind 13 to 17 mph, with gusts as high as 24 mph.

    High: 60 °F

    Partly Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 35. Northwest wind around 7 mph becoming northeast after midnight.

    Low: 35 °F

    Mostly Cloudy

  • Saturday

    Saturday: Partly sunny, with a high near 60.

    High: 60 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 49.

    Low: 49 °F

    Mostly Cloudy

  • Sunday

    Sunday: Rain likely and possibly a thunderstorm, then rain after 1pm. High near 65. Breezy. Chance of precipitation is 80%.

    High: 65 °F

    Rain and
    Breezy

  • Sunday Night

    Sunday Night: A chance of rain and snow before 1am. Mostly cloudy, with a low around 24. Blustery. Chance of precipitation is 30%.

    Low: 24 °F

    Chance
    Rain/Snow and
    Blustery

Detailed Forecast

Tonight
Mostly cloudy, then gradually becoming clear, with a low around 31. Northwest wind 13 to 18 mph decreasing to 7 to 12 mph after midnight. Winds could gust as high as 28 mph.
Thursday
Sunny, with a high near 53. Light west wind becoming southwest 6 to 11 mph in the morning.
Thursday Night
Partly cloudy, with a low around 43. Breezy, with a south wind 13 to 20 mph, with gusts as high as 31 mph.
Friday
Partly sunny, with a high near 60. Northwest wind 13 to 17 mph, with gusts as high as 24 mph.
Friday Night
Mostly cloudy, with a low around 35. Northwest wind around 7 mph becoming northeast after midnight.
Saturday
Partly sunny, with a high near 60.
Saturday Night
Mostly cloudy, with a low around 49.
Sunday
Rain likely and possibly a thunderstorm, then rain after 1pm. High near 65. Breezy. Chance of precipitation is 80%.
Sunday Night
A chance of rain and snow before 1am. Mostly cloudy, with a low around 24. Blustery. Chance of precipitation is 30%.
Monday
Partly sunny, with a high near 35. Breezy.
Monday Night
Mostly clear, with a low around 17.
Tuesday
Mostly sunny, with a high near 41.
Tuesday Night
A slight chance of rain and snow. Mostly cloudy, with a low around 31. Chance of precipitation is 20%.
Wednesday
Partly sunny, with a high near 55.
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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:
5:36 pm CDT Mar 11, 2026
Forecast Valid:
8pm CDT Mar 11, 2026-6pm CDT Mar 18, 2026
 
Forecast Discussion
 
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Additional Resources

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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