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.

Rain

40°F

4°C

Humidity 88%
Wind Speed N 9 G 21 mph
Barometer 30.21 in
Dewpoint 36°F (2°C)
Visibility 4.00 mi
Wind Chill34°F (1°C)
Last update 27 Mar 4:15 am CDT
Extended Forecast for

Bethalto IL

  • Overnight

    Overnight: Showers. Steady temperature around 46. Breezy, with a north wind around 20 mph, with gusts as high as 29 mph. Chance of precipitation is 80%.

    Low: 46 °F

    Showers and
    Breezy

  • Friday

    Friday: A 30 percent chance of showers, mainly before 7am. Cloudy, then gradually becoming mostly sunny, with a high near 52. North wind around 18 mph, with gusts as high as 26 mph.

    High: 52 °F

    Chance
    Showers then
    Partly Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 30. North wind 6 to 14 mph.

    Low: 30 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 55. Light and variable wind becoming south 5 to 9 mph in the morning.

    High: 55 °F

    Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 39. South wind around 9 mph.

    Low: 39 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly cloudy, with a high near 67.

    High: 67 °F

    Mostly Cloudy

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 56.

    Low: 56 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 81.

    High: 81 °F

    Mostly Sunny

  • Monday Night

    Monday Night: A 20 percent chance of rain and thunderstorms. Mostly cloudy, with a low around 64.

    Low: 64 °F

    Slight Chance
    T-storms

Detailed Forecast

Overnight
Showers. Steady temperature around 46. Breezy, with a north wind around 20 mph, with gusts as high as 29 mph. Chance of precipitation is 80%.
Friday
A 30 percent chance of showers, mainly before 7am. Cloudy, then gradually becoming mostly sunny, with a high near 52. North wind around 18 mph, with gusts as high as 26 mph.
Friday Night
Mostly clear, with a low around 30. North wind 6 to 14 mph.
Saturday
Sunny, with a high near 55. Light and variable wind becoming south 5 to 9 mph in the morning.
Saturday Night
Partly cloudy, with a low around 39. South wind around 9 mph.
Sunday
Mostly cloudy, with a high near 67.
Sunday Night
Partly cloudy, with a low around 56.
Monday
Mostly sunny, with a high near 81.
Monday Night
A 20 percent chance of rain and thunderstorms. Mostly cloudy, with a low around 64.
Tuesday
A 20 percent chance of rain. Partly sunny, with a high near 84. Breezy.
Tuesday Night
A 50 percent chance of rain and thunderstorms. Mostly cloudy, with a low around 61.
Wednesday
A 50 percent chance of rain and thunderstorms. Mostly cloudy, with a high near 75.
Wednesday Night
Rain and thunderstorms likely. Mostly cloudy, with a low around 54. Chance of precipitation is 70%.
Thursday
Rain and thunderstorms likely. Mostly cloudy, with a high near 67. Chance of precipitation is 60%.
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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:
2:51 am CDT Mar 27, 2026
Forecast Valid:
4am CDT Mar 27, 2026-6pm CDT Apr 2, 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