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

42°F

6°C

Humidity 49%
Wind Speed NE 3 mph
Barometer 29.85 in
Dewpoint 24°F (-4°C)
Visibility 10.00 mi
Last update 26 Feb 1:55 am CST
Extended Forecast for

Bethalto IL

  • Overnight

    Overnight: A 30 percent chance of rain, mainly before 3am. Mostly cloudy, with a low around 33. Northeast wind 7 to 10 mph.

    Low: 33 °F

    Chance Rain

  • Thursday

    Thursday: Mostly sunny, with a high near 54. East wind 5 to 8 mph becoming light and variable in the afternoon.

    High: 54 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Clear, with a low around 35. Calm wind becoming south around 5 mph after midnight.

    Low: 35 °F

    Clear

  • Friday

    Friday: Sunny, with a high near 71. Southwest wind 6 to 11 mph increasing to 12 to 17 mph in the afternoon.

    High: 71 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 39. Southwest wind 6 to 8 mph becoming northeast after midnight.

    Low: 39 °F

    Mostly Clear

  • Saturday

    Saturday: A 20 percent chance of rain after noon. Mostly sunny, with a high near 62.

    High: 62 °F

    Mostly Sunny
    then Slight
    Chance Rain

  • Saturday Night

    Saturday Night: A 20 percent chance of rain before midnight. Partly cloudy, with a low around 29.

    Low: 29 °F

    Slight Chance
    Rain then
    Partly Cloudy

  • Sunday

    Sunday: Rain and snow likely, mainly after noon. Cloudy, with a high near 39. Chance of precipitation is 60%.

    High: 39 °F

    Chance
    Rain/Snow
    then
    Rain/Snow
    Likely

  • Sunday Night

    Sunday Night: Rain and snow likely before midnight, then a chance of snow. Cloudy, with a low around 26. Chance of precipitation is 70%.

    Low: 26 °F

    Rain/Snow
    Likely then
    Chance Snow

Detailed Forecast

Overnight
A 30 percent chance of rain, mainly before 3am. Mostly cloudy, with a low around 33. Northeast wind 7 to 10 mph.
Thursday
Mostly sunny, with a high near 54. East wind 5 to 8 mph becoming light and variable in the afternoon.
Thursday Night
Clear, with a low around 35. Calm wind becoming south around 5 mph after midnight.
Friday
Sunny, with a high near 71. Southwest wind 6 to 11 mph increasing to 12 to 17 mph in the afternoon.
Friday Night
Mostly clear, with a low around 39. Southwest wind 6 to 8 mph becoming northeast after midnight.
Saturday
A 20 percent chance of rain after noon. Mostly sunny, with a high near 62.
Saturday Night
A 20 percent chance of rain before midnight. Partly cloudy, with a low around 29.
Sunday
Rain and snow likely, mainly after noon. Cloudy, with a high near 39. Chance of precipitation is 60%.
Sunday Night
Rain and snow likely before midnight, then a chance of snow. Cloudy, with a low around 26. Chance of precipitation is 70%.
Monday
A chance of rain and snow before noon, then a slight chance of rain. Cloudy, with a high near 39. Chance of precipitation is 30%.
Monday Night
A 40 percent chance of rain. Mostly cloudy, with a low around 26.
Tuesday
A 40 percent chance of rain. Cloudy, with a high near 42.
Tuesday Night
A 40 percent chance of rain. Mostly cloudy, with a low around 30.
Wednesday
A 40 percent chance of rain. Mostly cloudy, with a high near 50.
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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:
1:51 am CST Feb 26, 2026
Forecast Valid:
2am CST Feb 26, 2026-6pm CST Mar 4, 2026
 
Forecast Discussion
 
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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