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

71°F

22°C

Humidity 69%
Wind Speed S 15 G 21 mph
Barometer 29.97 in
Dewpoint 60°F (16°C)
Visibility 10.00 mi
Last update 13 Apr 1:15 am CDT
Extended Forecast for

Bethalto IL

  • Overnight

    Overnight: Mostly cloudy, with a low around 65. South wind around 11 mph, with gusts as high as 21 mph.

    Low: 65 °F

    Mostly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 84. South wind 10 to 17 mph, with gusts as high as 25 mph.

    High: 84 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 68. South wind 11 to 17 mph, with gusts as high as 29 mph.

    Low: 68 °F

    Partly Cloudy

  • Tuesday

    Tuesday: A 30 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 87. Southwest wind 10 to 17 mph, with gusts as high as 25 mph.

    High: 87 °F

    Mostly Sunny
    then Chance
    Showers

  • Tuesday Night

    Tuesday Night: A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 68. Southwest wind 10 to 14 mph, with gusts as high as 23 mph.

    Low: 68 °F

    Chance
    T-storms

  • Wednesday

    Wednesday: Showers and possibly a thunderstorm. High near 81. Chance of precipitation is 80%.

    High: 81 °F

    Showers

  • Wednesday Night

    Wednesday Night: Showers and possibly a thunderstorm. Low around 62. Chance of precipitation is 80%.

    Low: 62 °F

    Showers

  • Thursday

    Thursday: A chance of showers, with thunderstorms also possible after 7am. Mostly sunny, with a high near 82. Chance of precipitation is 40%.

    High: 82 °F

    Chance
    Showers

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 60.

    Low: 60 °F

    Mostly Clear

Detailed Forecast

Overnight
Mostly cloudy, with a low around 65. South wind around 11 mph, with gusts as high as 21 mph.
Monday
Mostly sunny, with a high near 84. South wind 10 to 17 mph, with gusts as high as 25 mph.
Monday Night
Partly cloudy, with a low around 68. South wind 11 to 17 mph, with gusts as high as 29 mph.
Tuesday
A 30 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 87. Southwest wind 10 to 17 mph, with gusts as high as 25 mph.
Tuesday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 68. Southwest wind 10 to 14 mph, with gusts as high as 23 mph.
Wednesday
Showers and possibly a thunderstorm. High near 81. Chance of precipitation is 80%.
Wednesday Night
Showers and possibly a thunderstorm. Low around 62. Chance of precipitation is 80%.
Thursday
A chance of showers, with thunderstorms also possible after 7am. Mostly sunny, with a high near 82. Chance of precipitation is 40%.
Thursday Night
Mostly clear, with a low around 60.
Friday
A 30 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 86.
Friday Night
Showers and thunderstorms likely. Mostly cloudy, with a low around 60. Chance of precipitation is 70%.
Saturday
A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 72.
Saturday Night
A 30 percent chance of showers. Mostly cloudy, with a low around 42.
Sunday
Sunny, with a high near 63.
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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:
1:26 am CDT Apr 13, 2026
Forecast Valid:
1am CDT Apr 13, 2026-6pm CDT Apr 19, 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