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

48°F

9°C

Humidity 46%
Wind Speed Vrbl 3 mph
Barometer 29.78 in
Dewpoint 28°F (-2°C)
Visibility 10.00 mi
Last update 25 Feb 10:50 am CST
Extended Forecast for

Bethalto IL

  • Today

    Today: Mostly cloudy, with a high near 51. Calm wind becoming northwest around 5 mph.

    High: 51 °F

    Mostly Cloudy

  • Tonight

    Tonight: A 40 percent chance of rain, mainly before 4am. Mostly cloudy, with a low around 33. Northeast wind 3 to 6 mph.

    Low: 33 °F

    Chance Rain

  • Thursday

    Thursday: Mostly cloudy, then gradually becoming sunny, with a high near 53. Northeast wind around 6 mph becoming light and variable in the afternoon.

    High: 53 °F

    Decreasing
    Clouds

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 34. Calm wind becoming south around 5 mph after midnight.

    Low: 34 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 67. Southwest wind 5 to 13 mph.

    High: 67 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 41.

    Low: 41 °F

    Mostly Clear

  • Saturday

    Saturday: Mostly sunny, with a high near 61.

    High: 61 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: A 20 percent chance of rain. Partly cloudy, with a low around 30.

    Low: 30 °F

    Slight Chance
    Rain

  • Sunday

    Sunday: A chance of rain before noon, then a chance of rain and snow. Mostly cloudy, with a high near 44. Chance of precipitation is 40%.

    High: 44 °F

    Chance Rain
    then Chance
    Rain/Snow

Detailed Forecast

Today
Mostly cloudy, with a high near 51. Calm wind becoming northwest around 5 mph.
Tonight
A 40 percent chance of rain, mainly before 4am. Mostly cloudy, with a low around 33. Northeast wind 3 to 6 mph.
Thursday
Mostly cloudy, then gradually becoming sunny, with a high near 53. Northeast wind around 6 mph becoming light and variable in the afternoon.
Thursday Night
Mostly clear, with a low around 34. Calm wind becoming south around 5 mph after midnight.
Friday
Sunny, with a high near 67. Southwest wind 5 to 13 mph.
Friday Night
Mostly clear, with a low around 41.
Saturday
Mostly sunny, with a high near 61.
Saturday Night
A 20 percent chance of rain. Partly cloudy, with a low around 30.
Sunday
A chance of rain before noon, then a chance of rain and snow. Mostly cloudy, with a high near 44. Chance of precipitation is 40%.
Sunday Night
Rain and snow likely, mainly before midnight. Mostly cloudy, with a low around 30. Chance of precipitation is 60%.
Monday
A 30 percent chance of rain. Mostly cloudy, with a high near 40.
Monday Night
A 40 percent chance of rain and thunderstorms. Mostly cloudy, with a low around 29.
Tuesday
A 50 percent chance of rain. Mostly cloudy, with a high near 46.
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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:
10:26 am CST Feb 25, 2026
Forecast Valid:
11am CST Feb 25, 2026-6pm CST Mar 3, 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