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

35°F

2°C

Humidity 81%
Wind Speed NW 7 mph
Barometer 30.30 in
Dewpoint 29°F (-2°C)
Visibility 10.00 mi
Wind Chill29°F (-2°C)
Last update 12 Mar 1:55 am CDT
Extended Forecast for

Bethalto IL

  • Overnight

    Overnight: Clear, with a low around 30. Northwest wind around 8 mph.

    Low: 30 °F

    Clear

  • Thursday

    Thursday: Sunny, with a high near 54. West wind 5 to 13 mph becoming southwest in the afternoon.

    High: 54 °F

    Sunny

  • Thursday Night

    Thursday Night: Increasing clouds, with a low around 43. Breezy, with a south wind 13 to 21 mph, with gusts as high as 37 mph.

    Low: 43 °F

    Increasing
    Clouds and
    Breezy

  • Friday

    Friday: Partly sunny, with a high near 59. West wind 16 to 18 mph, with gusts as high as 31 mph.

    High: 59 °F

    Partly Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 35. Northwest wind 5 to 8 mph becoming east after midnight.

    Low: 35 °F

    Mostly Cloudy

  • Saturday

    Saturday: Partly sunny, with a high near 61.

    High: 61 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 52.

    Low: 52 °F

    Mostly Cloudy

  • Sunday

    Sunday: Rain likely and possibly a thunderstorm, then rain after 1pm. High near 66. Breezy. Chance of precipitation is 80%.

    High: 66 °F

    Rain and
    Breezy

  • Sunday Night

    Sunday Night: Rain and snow likely before 1am, then a chance of snow. Some thunder is also possible. Mostly cloudy, with a low around 22. Breezy. Chance of precipitation is 60%.

    Low: 22 °F

    Rain/Snow
    Likely and
    Breezy

Detailed Forecast

Overnight
Clear, with a low around 30. Northwest wind around 8 mph.
Thursday
Sunny, with a high near 54. West wind 5 to 13 mph becoming southwest in the afternoon.
Thursday Night
Increasing clouds, with a low around 43. Breezy, with a south wind 13 to 21 mph, with gusts as high as 37 mph.
Friday
Partly sunny, with a high near 59. West wind 16 to 18 mph, with gusts as high as 31 mph.
Friday Night
Mostly cloudy, with a low around 35. Northwest wind 5 to 8 mph becoming east after midnight.
Saturday
Partly sunny, with a high near 61.
Saturday Night
Mostly cloudy, with a low around 52.
Sunday
Rain likely and possibly a thunderstorm, then rain after 1pm. High near 66. Breezy. Chance of precipitation is 80%.
Sunday Night
Rain and snow likely before 1am, then a chance of snow. Some thunder is also possible. Mostly cloudy, with a low around 22. Breezy. Chance of precipitation is 60%.
Monday
Mostly sunny, with a high near 31. Blustery.
Monday Night
Mostly clear, with a low around 14.
Tuesday
Partly sunny, with a high near 38.
Tuesday Night
A slight chance of rain and snow. Mostly cloudy, with a low around 29. Chance of precipitation is 20%.
Wednesday
Mostly cloudy, with a high near 57.
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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:
1:26 am CDT Mar 12, 2026
Forecast Valid:
2am CDT Mar 12, 2026-6pm CDT Mar 18, 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