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

46°F

8°C

Humidity 54%
Wind Speed NW 3 mph
Barometer 29.96 in
Dewpoint 30°F (-1°C)
Visibility 10.00 mi
Last update 16 Nov 4:55 am CST
Extended Forecast for

Bethalto IL

  • Today

    Today: Sunny, with a high near 58. Northwest wind 5 to 8 mph.

    High: 58 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 35. Light and variable wind.

    Low: 35 °F

    Mostly Clear

  • Monday

    Monday: Increasing clouds, with a high near 59. Light east wind becoming southeast 6 to 11 mph in the morning.

    High: 59 °F

    Increasing
    Clouds

  • Monday Night

    Monday Night: A chance of showers and thunderstorms before midnight, then showers likely and possibly a thunderstorm between midnight and 3am, then showers likely after 3am. Mostly cloudy, with a low around 47. Southeast wind around 10 mph. Chance of precipitation is 70%.

    Low: 47 °F

    Showers
    Likely

  • Tuesday

    Tuesday: A chance of showers before noon, then a slight chance of rain after noon. Partly sunny, with a high near 68. Southeast wind 7 to 10 mph. Chance of precipitation is 30%.

    High: 68 °F

    Chance
    Showers

  • Tuesday Night

    Tuesday Night: A 20 percent chance of rain before midnight. Mostly cloudy, with a low around 49.

    Low: 49 °F

    Slight Chance
    Rain then
    Mostly Cloudy

  • Wednesday

    Wednesday: A 20 percent chance of rain after noon. Mostly cloudy, with a high near 65.

    High: 65 °F

    Mostly Cloudy
    then Slight
    Chance Rain

  • Wednesday Night

    Wednesday Night: A 50 percent chance of rain. Mostly cloudy, with a low around 50.

    Low: 50 °F

    Chance Rain

  • Thursday

    Thursday: Rain likely and possibly a thunderstorm, then rain after noon. High near 65. Chance of precipitation is 80%.

    High: 65 °F

    Rain

Detailed Forecast

Today
Sunny, with a high near 58. Northwest wind 5 to 8 mph.
Tonight
Mostly clear, with a low around 35. Light and variable wind.
Monday
Increasing clouds, with a high near 59. Light east wind becoming southeast 6 to 11 mph in the morning.
Monday Night
A chance of showers and thunderstorms before midnight, then showers likely and possibly a thunderstorm between midnight and 3am, then showers likely after 3am. Mostly cloudy, with a low around 47. Southeast wind around 10 mph. Chance of precipitation is 70%.
Tuesday
A chance of showers before noon, then a slight chance of rain after noon. Partly sunny, with a high near 68. Southeast wind 7 to 10 mph. Chance of precipitation is 30%.
Tuesday Night
A 20 percent chance of rain before midnight. Mostly cloudy, with a low around 49.
Wednesday
A 20 percent chance of rain after noon. Mostly cloudy, with a high near 65.
Wednesday Night
A 50 percent chance of rain. Mostly cloudy, with a low around 50.
Thursday
Rain likely and possibly a thunderstorm, then rain after noon. High near 65. Chance of precipitation is 80%.
Thursday Night
Rain likely, with thunderstorms also possible after midnight. Mostly cloudy, with a low around 53. Chance of precipitation is 70%.
Friday
A 50 percent chance of rain. Partly sunny, with a high near 64.
Friday Night
A 30 percent chance of rain. Mostly cloudy, with a low around 41.
Saturday
Mostly sunny, with a high near 53.
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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:
3:06 am CST Nov 16, 2025
Forecast Valid:
5am CST Nov 16, 2025-6pm CST Nov 22, 2025
 
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