National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

St. Louis Regional Airport (KALN)

Lat: 38.89°NLon: 90.03°WElev: 518ft.

Fair

72°F

22°C

Humidity 29%
Wind Speed NW 14 mph
Barometer 30.03 in
Dewpoint 37°F (3°C)
Visibility 10.00 mi
Last update 13 May 6:50 pm CDT
Extended Forecast for

Bethalto IL

  • Tonight

    Tonight: Clear, with a low around 45. North wind 8 to 13 mph becoming light and variable in the evening.

    Low: 45 °F

    Clear

  • Thursday

    Thursday: Sunny, with a high near 73. Calm wind becoming south 5 to 8 mph in the morning.

    High: 73 °F

    Sunny

  • Thursday Night

    Thursday Night: A slight chance of showers between 3am and 4am, then a chance of showers and thunderstorms after 4am. Mostly cloudy, with a low around 54. Southeast wind 8 to 11 mph, with gusts as high as 20 mph. Chance of precipitation is 40%.

    Low: 54 °F

    Mostly Cloudy
    then Chance
    Showers

  • Friday

    Friday: Showers likely and possibly a thunderstorm before 10am, then a chance of showers and thunderstorms between 10am and 1pm. Cloudy, then gradually becoming mostly sunny, with a high near 82. South wind 13 to 17 mph, with gusts as high as 25 mph. Chance of precipitation is 60%.

    High: 82 °F

    Showers
    Likely

  • Friday Night

    Friday Night: A 40 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 64. South wind 7 to 11 mph.

    Low: 64 °F

    Partly Cloudy
    then Chance
    Showers

  • Saturday

    Saturday: Showers likely and possibly a thunderstorm. Partly sunny, with a high near 84. Chance of precipitation is 70%.

    High: 84 °F

    Showers
    Likely

  • Saturday Night

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

    Low: 64 °F

    Slight Chance
    T-storms

  • Sunday

    Sunday: Mostly sunny, with a high near 85. Breezy.

    High: 85 °F

    Mostly Sunny
    then Mostly
    Sunny and
    Breezy

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 69.

    Low: 69 °F

    Mostly Clear

Detailed Forecast

Tonight
Clear, with a low around 45. North wind 8 to 13 mph becoming light and variable in the evening.
Thursday
Sunny, with a high near 73. Calm wind becoming south 5 to 8 mph in the morning.
Thursday Night
A slight chance of showers between 3am and 4am, then a chance of showers and thunderstorms after 4am. Mostly cloudy, with a low around 54. Southeast wind 8 to 11 mph, with gusts as high as 20 mph. Chance of precipitation is 40%.
Friday
Showers likely and possibly a thunderstorm before 10am, then a chance of showers and thunderstorms between 10am and 1pm. Cloudy, then gradually becoming mostly sunny, with a high near 82. South wind 13 to 17 mph, with gusts as high as 25 mph. Chance of precipitation is 60%.
Friday Night
A 40 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 64. South wind 7 to 11 mph.
Saturday
Showers likely and possibly a thunderstorm. Partly sunny, with a high near 84. Chance of precipitation is 70%.
Saturday Night
A 20 percent chance of showers and thunderstorms before 1am. Mostly cloudy, with a low around 64.
Sunday
Mostly sunny, with a high near 85. Breezy.
Sunday Night
Mostly clear, with a low around 69.
Monday
A 30 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 88. Breezy.
Monday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 69. Chance of precipitation is 60%.
Tuesday
Showers likely and possibly a thunderstorm. Partly sunny, with a high near 81. Chance of precipitation is 70%.
Tuesday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 62.
Wednesday
A 30 percent chance of showers. Partly sunny, with a high near 77.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Bethalto IL
 38.88°N 90.02°W (Elev. 499 ft)
Last Update:
5:51 pm CDT May 13, 2026
Forecast Valid:
7pm CDT May 13, 2026-6pm CDT May 20, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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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