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.

Rain

63°F

17°C

Humidity 94%
Wind Speed W 6 mph
Barometer 29.78 in
Dewpoint 61°F (16°C)
Visibility 7.00 mi
Last update 18 Apr 12:55 am CDT
Extended Forecast for

Bethalto IL

  • Overnight

    Overnight: Showers and possibly a thunderstorm. Low around 48. West wind 11 to 14 mph, with gusts as high as 22 mph. Chance of precipitation is 100%.

    Low: 48 °F

    Showers

  • Saturday

    Saturday: A 30 percent chance of showers, mainly before 7am. Cloudy through mid morning, then gradual clearing, with a high near 58. Northwest wind around 17 mph, with gusts as high as 26 mph.

    High: 58 °F

    Chance
    Showers then
    Mostly Sunny

  • Saturday Night

    Saturday Night: Clear, with a low around 39. Northwest wind 5 to 14 mph becoming southwest after midnight.

    Low: 39 °F

    Clear

  • Sunday

    Sunday: Sunny, with a high near 66. West wind 5 to 15 mph, with gusts as high as 22 mph.

    High: 66 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 39. Northwest wind 5 to 8 mph becoming northeast after midnight.

    Low: 39 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 67.

    High: 67 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 51.

    Low: 51 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 79.

    High: 79 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: A slight chance of showers and thunderstorms. Partly cloudy, with a low around 57. Chance of precipitation is 20%.

    Low: 57 °F

    Slight Chance
    T-storms

Detailed Forecast

Overnight
Showers and possibly a thunderstorm. Low around 48. West wind 11 to 14 mph, with gusts as high as 22 mph. Chance of precipitation is 100%.
Saturday
A 30 percent chance of showers, mainly before 7am. Cloudy through mid morning, then gradual clearing, with a high near 58. Northwest wind around 17 mph, with gusts as high as 26 mph.
Saturday Night
Clear, with a low around 39. Northwest wind 5 to 14 mph becoming southwest after midnight.
Sunday
Sunny, with a high near 66. West wind 5 to 15 mph, with gusts as high as 22 mph.
Sunday Night
Mostly clear, with a low around 39. Northwest wind 5 to 8 mph becoming northeast after midnight.
Monday
Sunny, with a high near 67.
Monday Night
Mostly clear, with a low around 51.
Tuesday
Mostly sunny, with a high near 79.
Tuesday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 57. Chance of precipitation is 20%.
Wednesday
Sunny, with a high near 81.
Wednesday Night
Mostly clear, with a low around 59.
Thursday
A 20 percent chance of showers and thunderstorms. Sunny, with a high near 83.
Thursday Night
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 62.
Friday
A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 78.
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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:
10:51 pm CDT Apr 17, 2026
Forecast Valid:
1am CDT Apr 18, 2026-6pm CDT Apr 24, 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