National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

St. Louis Regional Airport (KALN)

Lat: 38.89°NLon: 90.03°WElev: 518ft.

Fair

64°F

18°C

Humidity 78%
Wind Speed SW 12 mph
Barometer 29.67 in
Dewpoint 57°F (14°C)
Visibility 10.00 mi
Last update 22 Mar 7:50 am CDT
Extended Forecast for

Bethalto IL

  • Today

    Today: Increasing clouds, with a high near 86. South wind 8 to 16 mph becoming northwest in the afternoon.

    High: 86 °F

    Increasing
    Clouds

  • Tonight

    Tonight: A 20 percent chance of showers and thunderstorms before 9pm. Mostly cloudy, then gradually becoming mostly clear, with a low around 35. Breezy, with a north wind 19 to 24 mph decreasing to 13 to 18 mph after midnight. Winds could gust as high as 37 mph.

    Low: 35 °F

    Slight Chance
    T-storms and
    Breezy then
    Mostly Clear

  • Monday

    Monday: Mostly sunny, with a high near 55. Northeast wind 9 to 11 mph.

    High: 55 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 38. Northeast wind around 6 mph.

    Low: 38 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 64. Southeast wind 6 to 8 mph.

    High: 64 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 45.

    Low: 45 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 74.

    High: 74 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 60.

    Low: 60 °F

    Slight Chance
    T-storms

  • Thursday

    Thursday: A 20 percent chance of showers and thunderstorms after 1pm. Sunny, with a high near 86.

    High: 86 °F

    Sunny then
    Slight Chance
    T-storms

Detailed Forecast

Today
Increasing clouds, with a high near 86. South wind 8 to 16 mph becoming northwest in the afternoon.
Tonight
A 20 percent chance of showers and thunderstorms before 9pm. Mostly cloudy, then gradually becoming mostly clear, with a low around 35. Breezy, with a north wind 19 to 24 mph decreasing to 13 to 18 mph after midnight. Winds could gust as high as 37 mph.
Monday
Mostly sunny, with a high near 55. Northeast wind 9 to 11 mph.
Monday Night
Mostly cloudy, with a low around 38. Northeast wind around 6 mph.
Tuesday
Mostly sunny, with a high near 64. Southeast wind 6 to 8 mph.
Tuesday Night
Mostly cloudy, with a low around 45.
Wednesday
Partly sunny, with a high near 74.
Wednesday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 60.
Thursday
A 20 percent chance of showers and thunderstorms after 1pm. Sunny, with a high near 86.
Thursday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 42.
Friday
A 40 percent chance of showers. Partly sunny, with a high near 52.
Friday Night
A 20 percent chance of showers. Partly cloudy, with a low around 32.
Saturday
Mostly sunny, with a high near 57.
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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:
4:16 am CDT Mar 22, 2026
Forecast Valid:
8am CDT Mar 22, 2026-6pm CDT Mar 28, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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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