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

42°F

6°C

Humidity 62%
Wind Speed S 7 mph
Barometer 30.08 in
Dewpoint 29°F (-2°C)
Visibility 10.00 mi
Wind Chill38°F (3°C)
Last update 13 Feb 11:55 pm CST
Extended Forecast for

Bethalto IL

  • Overnight

    Overnight: Mostly cloudy, with a low around 36. South wind around 6 mph becoming calm.

    Low: 36 °F

    Mostly Cloudy

  • Saturday

    Saturday: Rain, mainly after 11am. High near 51. Calm wind becoming southeast 5 to 8 mph in the morning. Chance of precipitation is 90%.

    High: 51 °F

    Rain Likely
    then Rain

  • Saturday Night

    Saturday Night: Rain, mainly before 4am. Low around 43. East wind around 8 mph. Chance of precipitation is 90%.

    Low: 43 °F

    Rain

  • Sunday

    Sunday: A 20 percent chance of rain before noon. Cloudy through mid morning, then gradual clearing, with a high near 57. Northeast wind 7 to 10 mph.

    High: 57 °F

    Slight Chance
    Rain then
    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 37. North wind around 6 mph becoming calm in the evening.

    Low: 37 °F

    Mostly Clear

  • Washington's Birthday

    Washington's Birthday: Mostly sunny, with a high near 60.

    High: 60 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 43.

    Low: 43 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 64.

    High: 64 °F

    Mostly Cloudy

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 54.

    Low: 54 °F

    Mostly Cloudy

Detailed Forecast

Overnight
Mostly cloudy, with a low around 36. South wind around 6 mph becoming calm.
Saturday
Rain, mainly after 11am. High near 51. Calm wind becoming southeast 5 to 8 mph in the morning. Chance of precipitation is 90%.
Saturday Night
Rain, mainly before 4am. Low around 43. East wind around 8 mph. Chance of precipitation is 90%.
Sunday
A 20 percent chance of rain before noon. Cloudy through mid morning, then gradual clearing, with a high near 57. Northeast wind 7 to 10 mph.
Sunday Night
Mostly clear, with a low around 37. North wind around 6 mph becoming calm in the evening.
Washington's Birthday
Mostly sunny, with a high near 60.
Monday Night
Mostly cloudy, with a low around 43.
Tuesday
Mostly cloudy, with a high near 64.
Tuesday Night
Mostly cloudy, with a low around 54.
Wednesday
Partly sunny, with a high near 70.
Wednesday Night
A 20 percent chance of rain. Mostly cloudy, with a low around 46.
Thursday
A 20 percent chance of rain. Mostly sunny, with a high near 63.
Thursday Night
Partly cloudy, with a low around 40.
Friday
A 20 percent chance of rain. Mostly sunny, with a high near 56.
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:
11:41 pm CST Feb 13, 2026
Forecast Valid:
12am CST Feb 14, 2026-6pm CST Feb 20, 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