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.

Overcast

30°F

-1°C

Humidity 73%
Wind Speed NE 6 mph
Barometer 30.01 in
Dewpoint 22°F (-6°C)
Visibility 10.00 mi
Wind Chill24°F (-4°C)
Last update 2 Jan 11:55 pm CST
Extended Forecast for

Bethalto IL

  • Overnight

    Overnight: Mostly cloudy, with a low around 26. Northeast wind around 5 mph.

    Low: 26 °F

    Mostly Cloudy

  • Saturday

    Saturday: Mostly cloudy through mid morning, then gradual clearing, with a high near 39. Northwest wind 5 to 8 mph.

    High: 39 °F

    Becoming
    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 24. Northwest wind around 6 mph becoming calm after midnight.

    Low: 24 °F

    Mostly Clear

  • Sunday

    Sunday: Increasing clouds, with a high near 39. Calm wind becoming southeast around 6 mph in the afternoon.

    High: 39 °F

    Increasing
    Clouds

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 29. South wind 6 to 8 mph.

    Low: 29 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 55.

    High: 55 °F

    Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 42.

    Low: 42 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 59.

    High: 59 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 38.

    Low: 38 °F

    Mostly Cloudy

Detailed Forecast

Overnight
Mostly cloudy, with a low around 26. Northeast wind around 5 mph.
Saturday
Mostly cloudy through mid morning, then gradual clearing, with a high near 39. Northwest wind 5 to 8 mph.
Saturday Night
Mostly clear, with a low around 24. Northwest wind around 6 mph becoming calm after midnight.
Sunday
Increasing clouds, with a high near 39. Calm wind becoming southeast around 6 mph in the afternoon.
Sunday Night
Mostly clear, with a low around 29. South wind 6 to 8 mph.
Monday
Sunny, with a high near 55.
Monday Night
Partly cloudy, with a low around 42.
Tuesday
Mostly sunny, with a high near 59.
Tuesday Night
Mostly cloudy, with a low around 38.
Wednesday
Mostly sunny, with a high near 59.
Wednesday Night
A 20 percent chance of rain. Mostly cloudy, with a low around 46.
Thursday
A 50 percent chance of rain. Partly sunny, with a high near 61.
Thursday Night
A 40 percent chance of rain. Partly cloudy, with a low around 47.
Friday
A 20 percent chance of rain. Partly sunny, with a high near 58.
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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:
10:31 pm CST Jan 2, 2026
Forecast Valid:
12am CST Jan 3, 2026-6pm CST Jan 9, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation