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

75°F

24°C

Humidity 74%
Wind Speed NE 5 mph
Barometer 29.97 in
Dewpoint 66°F (19°C)
Visibility 10.00 mi
Last update 29 Jul 8:45 pm CDT
Extended Forecast for

Bethalto IL

  • Tonight

    Tonight: Clear, with a low around 64. East wind 3 to 5 mph.

    Low: 64 °F

    Clear

  • Thursday

    Thursday: Mostly sunny, with a high near 85. East wind 3 to 7 mph.

    High: 85 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 66. East wind around 6 mph.

    Low: 66 °F

    Partly Cloudy

  • Friday

    Friday: Showers likely, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 82. South wind 7 to 14 mph. Chance of precipitation is 70%.

    High: 82 °F

    Showers
    Likely

  • Friday Night

    Friday Night: Showers and possibly a thunderstorm before 4am, then showers likely. Low around 67. Southeast wind 9 to 13 mph becoming west after midnight. Winds could gust as high as 20 mph. Chance of precipitation is 80%.

    Low: 67 °F

    Showers

  • Saturday

    Saturday: A chance of showers, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 79. Chance of precipitation is 50%.

    High: 79 °F

    Chance
    Showers then
    Chance
    T-storms

  • Saturday Night

    Saturday Night: A 20 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 64.

    Low: 64 °F

    Slight Chance
    T-storms

  • Sunday

    Sunday: A 20 percent chance of showers after 1pm. Mostly sunny, with a high near 82.

    High: 82 °F

    Mostly Sunny
    then Slight
    Chance
    Showers

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 64.

    Low: 64 °F

    Mostly Clear

Detailed Forecast

Tonight
Clear, with a low around 64. East wind 3 to 5 mph.
Thursday
Mostly sunny, with a high near 85. East wind 3 to 7 mph.
Thursday Night
Partly cloudy, with a low around 66. East wind around 6 mph.
Friday
Showers likely, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 82. South wind 7 to 14 mph. Chance of precipitation is 70%.
Friday Night
Showers and possibly a thunderstorm before 4am, then showers likely. Low around 67. Southeast wind 9 to 13 mph becoming west after midnight. Winds could gust as high as 20 mph. Chance of precipitation is 80%.
Saturday
A chance of showers, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 79. Chance of precipitation is 50%.
Saturday Night
A 20 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 64.
Sunday
A 20 percent chance of showers after 1pm. Mostly sunny, with a high near 82.
Sunday Night
Mostly clear, with a low around 64.
Monday
A 20 percent chance of showers and thunderstorms after 1pm. Sunny, with a high near 84.
Monday Night
Mostly clear, with a low around 66.
Tuesday
A 20 percent chance of showers and thunderstorms. Sunny, with a high near 86.
Tuesday Night
Mostly clear, with a low around 68.
Wednesday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 88.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Bethalto IL
 38.9°N 90.05°W (Elev. 512 ft)
Last Update:
5:26 pm CDT Jul 29, 2026
Forecast Valid:
9pm CDT Jul 29, 2026-6pm CDT Aug 5, 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