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NWS St. Louis Announces Changes To May 16, 2025 Tornado Damage Assessment

After a year-long review of new ground survey data and aerial imagery, NWS St. Louis made several adjustments to the May 16, 2025 tornado damage assessment. Read More >

Hazardous Weather Conditions

Current conditions at

St. Louis Regional Airport (KALN)

Lat: 38.89°NLon: 90.03°WElev: 518ft.

Overcast

64°F

18°C

Humidity 73%
Wind Speed NE 7 mph
Barometer 30.08 in
Dewpoint 55°F (13°C)
Visibility 10.00 mi
Last update 21 May 8:50 pm CDT
Extended Forecast for

Bethalto IL

  • Tonight

    Tonight: Mostly cloudy, with a low around 56. East wind around 7 mph, with gusts as high as 20 mph.

    Low: 56 °F

    Mostly Cloudy

  • Friday

    Friday: A 40 percent chance of showers, mainly after noon. Cloudy, with a high near 68. Northeast wind 7 to 9 mph.

    High: 68 °F

    Chance
    Showers

  • Friday Night

    Friday Night: A 40 percent chance of showers, mainly after 7pm. Mostly cloudy, with a low around 57. Northeast wind around 6 mph becoming calm in the evening.

    Low: 57 °F

    Chance
    Showers

  • Saturday

    Saturday: Partly sunny, with a high near 78. Northwest wind 3 to 5 mph.

    High: 78 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: A 30 percent chance of showers after 1am. Mostly cloudy, with a low around 61. Light and variable wind.

    Low: 61 °F

    Mostly Cloudy
    then Chance
    Showers

  • Sunday

    Sunday: A chance of showers, with thunderstorms also possible after 10am. Mostly cloudy, with a high near 79. Chance of precipitation is 50%.

    High: 79 °F

    Chance
    Showers then
    Chance
    T-storms

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 60.

    Low: 60 °F

    Mostly Cloudy

  • Memorial Day

    Memorial Day: A 30 percent chance of showers and thunderstorms, mainly before 1pm. Partly sunny, with a high near 82.

    High: 82 °F

    Chance
    Showers

  • Monday Night

    Monday Night: A 20 percent chance of showers after 1am. Mostly cloudy, with a low around 62.

    Low: 62 °F

    Mostly Cloudy
    then Slight
    Chance
    Showers

Detailed Forecast

Tonight
Mostly cloudy, with a low around 56. East wind around 7 mph, with gusts as high as 20 mph.
Friday
A 40 percent chance of showers, mainly after noon. Cloudy, with a high near 68. Northeast wind 7 to 9 mph.
Friday Night
A 40 percent chance of showers, mainly after 7pm. Mostly cloudy, with a low around 57. Northeast wind around 6 mph becoming calm in the evening.
Saturday
Partly sunny, with a high near 78. Northwest wind 3 to 5 mph.
Saturday Night
A 30 percent chance of showers after 1am. Mostly cloudy, with a low around 61. Light and variable wind.
Sunday
A chance of showers, with thunderstorms also possible after 10am. Mostly cloudy, with a high near 79. Chance of precipitation is 50%.
Sunday Night
Mostly cloudy, with a low around 60.
Memorial Day
A 30 percent chance of showers and thunderstorms, mainly before 1pm. Partly sunny, with a high near 82.
Monday Night
A 20 percent chance of showers after 1am. Mostly cloudy, with a low around 62.
Tuesday
A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 82.
Tuesday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 64.
Wednesday
A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 84.
Wednesday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 66.
Thursday
A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 85.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Bethalto IL
 38.9°N 90.05°W (Elev. 512 ft)
Last Update:
6:06 pm CDT May 21, 2026
Forecast Valid:
8pm CDT May 21, 2026-6pm CDT May 28, 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