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

58°F

14°C

Humidity 94%
Wind Speed S 8 mph
Barometer 29.74 in
Dewpoint 56°F (13°C)
Visibility 10.00 mi
Last update 26 Dec 5:35 am CST
Extended Forecast for

Bethalto IL

  • Today

    Today: Mostly cloudy, with a high near 65. South wind 6 to 11 mph becoming northwest in the afternoon.

    High: 65 °F

    Mostly Cloudy

  • Tonight

    Tonight: Mostly cloudy, with a low around 45. Northwest wind around 5 mph becoming calm.

    Low: 45 °F

    Mostly Cloudy

  • Saturday

    Saturday: Mostly cloudy, with a high near 65. Southeast wind 6 to 13 mph.

    High: 65 °F

    Mostly Cloudy

  • Saturday Night

    Saturday Night: A 30 percent chance of rain, mainly after midnight. Cloudy, with a low around 59. South wind 7 to 10 mph.

    Low: 59 °F

    Chance Rain

  • Sunday

    Sunday: Rain and possibly a thunderstorm. High near 69. South wind 7 to 15 mph becoming west in the afternoon. Chance of precipitation is 90%.

    High: 69 °F

    Rain Likely
    then Rain

  • Sunday Night

    Sunday Night: A chance of rain, mixing with snow after 9pm, then gradually ending. Mostly cloudy, with a low around 21. Blustery. Chance of precipitation is 50%.

    Low: 21 °F

    Blustery.
    Chance
    Rain/Snow
    then Mostly
    Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 28. Blustery.

    High: 28 °F

    Mostly Sunny
    and Blustery

  • Monday Night

    Monday Night: Mostly clear, with a low around 18.

    Low: 18 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 35.

    High: 35 °F

    Sunny

Detailed Forecast

Today
Mostly cloudy, with a high near 65. South wind 6 to 11 mph becoming northwest in the afternoon.
Tonight
Mostly cloudy, with a low around 45. Northwest wind around 5 mph becoming calm.
Saturday
Mostly cloudy, with a high near 65. Southeast wind 6 to 13 mph.
Saturday Night
A 30 percent chance of rain, mainly after midnight. Cloudy, with a low around 59. South wind 7 to 10 mph.
Sunday
Rain and possibly a thunderstorm. High near 69. South wind 7 to 15 mph becoming west in the afternoon. Chance of precipitation is 90%.
Sunday Night
A chance of rain, mixing with snow after 9pm, then gradually ending. Mostly cloudy, with a low around 21. Blustery. Chance of precipitation is 50%.
Monday
Mostly sunny, with a high near 28. Blustery.
Monday Night
Mostly clear, with a low around 18.
Tuesday
Sunny, with a high near 35.
Tuesday Night
Partly cloudy, with a low around 25.
Wednesday
Mostly sunny, with a high near 39.
Wednesday Night
Mostly cloudy, with a low around 20.
New Year's Day
Partly sunny, with a high near 34.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Bethalto IL
 38.88°N 90.02°W (Elev. 499 ft)
Last Update:
5:46 am CST Dec 26, 2025
Forecast Valid:
6am CST Dec 26, 2025-6pm CST Jan 1, 2026
 
Forecast Discussion
 
Get as KML Get as XML

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