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

59°F

15°C

Humidity 68%
Wind Speed E 8 mph
Barometer 29.91 in
Dewpoint 48°F (9°C)
Visibility 10.00 mi
Last update 21 Mar 8:45 am CDT
Extended Forecast for

Bethalto IL

  • Today

    Today: Sunny, with a high near 87. Southeast wind 5 to 7 mph.

    High: 87 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 62. South wind 7 to 9 mph.

    Low: 62 °F

    Mostly Clear

  • Sunday

    Sunday: Increasing clouds, with a high near 87. Southwest wind 9 to 18 mph becoming northwest in the afternoon. Winds could gust as high as 26 mph.

    High: 87 °F

    Increasing
    Clouds

  • Sunday Night

    Sunday Night: A 20 percent chance of showers before 1am. Mostly cloudy, then gradually becoming mostly clear, with a low around 38. Breezy, with a north wind 18 to 23 mph decreasing to 11 to 16 mph after midnight. Winds could gust as high as 33 mph.

    Low: 38 °F

    Slight Chance
    Showers and
    Breezy

  • Monday

    Monday: Mostly sunny, with a high near 57. Northeast wind around 10 mph.

    High: 57 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 40.

    Low: 40 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Partly sunny, with a high near 61.

    High: 61 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: A 20 percent chance of showers. Mostly cloudy, with a low around 44.

    Low: 44 °F

    Slight Chance
    Showers

  • Wednesday

    Wednesday: A 20 percent chance of showers before 1pm. Partly sunny, with a high near 71.

    High: 71 °F

    Slight Chance
    Showers

Detailed Forecast

Today
Sunny, with a high near 87. Southeast wind 5 to 7 mph.
Tonight
Mostly clear, with a low around 62. South wind 7 to 9 mph.
Sunday
Increasing clouds, with a high near 87. Southwest wind 9 to 18 mph becoming northwest in the afternoon. Winds could gust as high as 26 mph.
Sunday Night
A 20 percent chance of showers before 1am. Mostly cloudy, then gradually becoming mostly clear, with a low around 38. Breezy, with a north wind 18 to 23 mph decreasing to 11 to 16 mph after midnight. Winds could gust as high as 33 mph.
Monday
Mostly sunny, with a high near 57. Northeast wind around 10 mph.
Monday Night
Mostly cloudy, with a low around 40.
Tuesday
Partly sunny, with a high near 61.
Tuesday Night
A 20 percent chance of showers. Mostly cloudy, with a low around 44.
Wednesday
A 20 percent chance of showers before 1pm. Partly sunny, with a high near 71.
Wednesday Night
A 20 percent chance of showers. Mostly cloudy, with a low around 54.
Thursday
A 20 percent chance of showers. Mostly sunny, with a high near 80.
Thursday Night
A 40 percent chance of showers and thunderstorms. Partly cloudy, with a low around 44.
Friday
A 30 percent chance of showers. Partly sunny, with a high near 56.
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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:
8:31 am CDT Mar 21, 2026
Forecast Valid:
9am CDT Mar 21, 2026-6pm CDT Mar 27, 2026
 
Forecast Discussion
 
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Additional Resources

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High Temperature

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Chance of Precipitation