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

71°F

22°C

Humidity 66%
Wind Speed SW 16 G 22 mph
Barometer 29.94 in
Dewpoint 59°F (15°C)
Visibility 10.00 mi
Last update 12 Apr 11:15 pm CDT
Extended Forecast for

Bethalto IL

  • Tonight

    Tonight: A 30 percent chance of showers before 1am. Mostly cloudy, with a low around 64. Southwest wind 10 to 16 mph, with gusts as high as 25 mph.

    Low: 64 °F

    Chance
    Showers

  • Monday

    Monday: Mostly sunny, with a high near 85. South wind 10 to 18 mph, with gusts as high as 25 mph.

    High: 85 °F

    Mostly Sunny

  • Monday Night

    Monday Night: A slight chance of showers and thunderstorms before 8pm, then a slight chance of showers after 4am. Partly cloudy, with a low around 67. South wind 11 to 16 mph, with gusts as high as 24 mph. Chance of precipitation is 20%.

    Low: 67 °F

    Slight Chance
    T-storms then
    Slight Chance
    Showers

  • Tuesday

    Tuesday: A slight chance of showers before 7am, then a chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 88. Southwest wind 10 to 18 mph, with gusts as high as 25 mph. Chance of precipitation is 30%.

    High: 88 °F

    Mostly Sunny
    then Chance
    T-storms

  • Tuesday Night

    Tuesday Night: A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 68. South wind 10 to 16 mph, with gusts as high as 23 mph.

    Low: 68 °F

    Chance
    T-storms

  • Wednesday

    Wednesday: Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 80. Chance of precipitation is 70%.

    High: 80 °F

    Showers
    Likely

  • Wednesday Night

    Wednesday Night: Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 62. Chance of precipitation is 60%.

    Low: 62 °F

    Showers
    Likely

  • Thursday

    Thursday: A 20 percent chance of showers before 1pm. Mostly sunny, with a high near 83.

    High: 83 °F

    Slight Chance
    Showers

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 61.

    Low: 61 °F

    Mostly Clear

Detailed Forecast

Tonight
A 30 percent chance of showers before 1am. Mostly cloudy, with a low around 64. Southwest wind 10 to 16 mph, with gusts as high as 25 mph.
Monday
Mostly sunny, with a high near 85. South wind 10 to 18 mph, with gusts as high as 25 mph.
Monday Night
A slight chance of showers and thunderstorms before 8pm, then a slight chance of showers after 4am. Partly cloudy, with a low around 67. South wind 11 to 16 mph, with gusts as high as 24 mph. Chance of precipitation is 20%.
Tuesday
A slight chance of showers before 7am, then a chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 88. Southwest wind 10 to 18 mph, with gusts as high as 25 mph. Chance of precipitation is 30%.
Tuesday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 68. South wind 10 to 16 mph, with gusts as high as 23 mph.
Wednesday
Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 80. Chance of precipitation is 70%.
Wednesday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 62. Chance of precipitation is 60%.
Thursday
A 20 percent chance of showers before 1pm. Mostly sunny, with a high near 83.
Thursday Night
Mostly clear, with a low around 61.
Friday
A 30 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 87.
Friday Night
Showers and thunderstorms likely. Mostly cloudy, with a low around 63. Chance of precipitation is 60%.
Saturday
Showers likely and possibly a thunderstorm. Partly sunny, with a high near 77. Chance of precipitation is 60%.
Saturday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 44.
Sunday
Mostly sunny, with a high near 62.
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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:
11:11 pm CDT Apr 12, 2026
Forecast Valid:
11pm CDT Apr 12, 2026-6pm CDT Apr 19, 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