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 77%
Wind Speed Calm
Barometer 29.63 in
Dewpoint 41°F (5°C)
Visibility 10.00 mi
Last update 18 Feb 10:15 pm CST
Extended Forecast for

Bethalto IL

  • Tonight

    Tonight: Mostly cloudy, with a low around 48. Southeast wind 3 to 5 mph.

    Low: 48 °F

    Mostly Cloudy

  • Thursday

    Thursday: Showers and thunderstorms likely, mainly before 4pm. Partly sunny, with a high near 68. Southeast wind 5 to 10 mph becoming southwest 12 to 17 mph in the afternoon. Winds could gust as high as 26 mph. Chance of precipitation is 60%.

    High: 68 °F

    Showers
    Likely then
    Scattered
    T-storms

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 35. Breezy, with a west wind 11 to 20 mph, with gusts as high as 29 mph.

    Low: 35 °F

    Mostly Clear
    then Mostly
    Clear and
    Breezy

  • Friday

    Friday: Sunny, with a high near 47. West wind 8 to 18 mph, with gusts as high as 26 mph.

    High: 47 °F

    Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 29. Northwest wind around 6 mph.

    Low: 29 °F

    Partly Cloudy

  • Saturday

    Saturday: A slight chance of rain and snow after noon. Mostly sunny, with a high near 43. Chance of precipitation is 20%.

    High: 43 °F

    Mostly Sunny
    then Slight
    Chance
    Rain/Snow

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 24.

    Low: 24 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 38. Breezy.

    High: 38 °F

    Sunny then
    Mostly Sunny
    and Breezy

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 19.

    Low: 19 °F

    Mostly Clear

Detailed Forecast

Tonight
Mostly cloudy, with a low around 48. Southeast wind 3 to 5 mph.
Thursday
Showers and thunderstorms likely, mainly before 4pm. Partly sunny, with a high near 68. Southeast wind 5 to 10 mph becoming southwest 12 to 17 mph in the afternoon. Winds could gust as high as 26 mph. Chance of precipitation is 60%.
Thursday Night
Mostly clear, with a low around 35. Breezy, with a west wind 11 to 20 mph, with gusts as high as 29 mph.
Friday
Sunny, with a high near 47. West wind 8 to 18 mph, with gusts as high as 26 mph.
Friday Night
Partly cloudy, with a low around 29. Northwest wind around 6 mph.
Saturday
A slight chance of rain and snow after noon. Mostly sunny, with a high near 43. Chance of precipitation is 20%.
Saturday Night
Mostly clear, with a low around 24.
Sunday
Sunny, with a high near 38. Breezy.
Sunday Night
Mostly clear, with a low around 19.
Monday
Sunny, with a high near 37.
Monday Night
Partly cloudy, with a low around 21.
Tuesday
Mostly sunny, with a high near 49.
Tuesday Night
Mostly cloudy, with a low around 37.
Wednesday
A 20 percent chance of rain. Partly sunny, with a high near 56.
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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:
9:36 pm CST Feb 18, 2026
Forecast Valid:
10pm CST Feb 18, 2026-6pm CST Feb 25, 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