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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

63°F

17°C

Humidity 77%
Wind Speed Calm
Barometer 30.07 in
Dewpoint 56°F (13°C)
Visibility 10.00 mi
Last update 21 May 11:15 pm CDT
Extended Forecast for

Pontoon Beach IL

  • Tonight

    Tonight: Mostly cloudy, with a low around 59. East wind around 6 mph, with gusts as high as 20 mph.

    Low: 59 °F

    Mostly Cloudy

  • Friday

    Friday: A 50 percent chance of showers, mainly after 1pm. Mostly cloudy, with a high near 70. Northeast wind around 8 mph.

    High: 70 °F

    Mostly Cloudy
    then Chance
    Showers

  • Friday Night

    Friday Night: A 20 percent chance of showers before 8pm. Cloudy, with a low around 58. Northeast wind around 6 mph becoming calm in the evening.

    Low: 58 °F

    Slight Chance
    Showers then
    Mostly Cloudy

  • Saturday

    Saturday: A slight chance of showers between 1pm and 4pm. Partly sunny, with a high near 81. Calm wind becoming northwest around 5 mph in the afternoon. Chance of precipitation is 20%.

    High: 81 °F

    Partly Sunny
    then Slight
    Chance
    Showers

  • Saturday Night

    Saturday Night: A 30 percent chance of showers, mainly after 1am. Mostly cloudy, with a low around 62. Calm wind.

    Low: 62 °F

    Chance
    Showers

  • Sunday

    Sunday: A chance of showers, with thunderstorms also possible after 10am. Mostly cloudy, with a high near 80. Chance of precipitation is 50%.

    High: 80 °F

    Chance
    Showers then
    Chance
    T-storms

  • Sunday Night

    Sunday Night: A 20 percent chance of showers after 1am. Mostly cloudy, with a low around 63.

    Low: 63 °F

    Mostly Cloudy
    then Slight
    Chance
    Showers

  • Memorial Day

    Memorial Day: A 30 percent chance of showers and thunderstorms, mainly before 1pm. Partly sunny, with a high near 83.

    High: 83 °F

    Chance
    Showers

  • Monday Night

    Monday Night: A 20 percent chance of showers after 1am. Mostly cloudy, with a low around 64.

    Low: 64 °F

    Mostly Cloudy
    then Slight
    Chance
    Showers

Detailed Forecast

Tonight
Mostly cloudy, with a low around 59. East wind around 6 mph, with gusts as high as 20 mph.
Friday
A 50 percent chance of showers, mainly after 1pm. Mostly cloudy, with a high near 70. Northeast wind around 8 mph.
Friday Night
A 20 percent chance of showers before 8pm. Cloudy, with a low around 58. Northeast wind around 6 mph becoming calm in the evening.
Saturday
A slight chance of showers between 1pm and 4pm. Partly sunny, with a high near 81. Calm wind becoming northwest around 5 mph in the afternoon. Chance of precipitation is 20%.
Saturday Night
A 30 percent chance of showers, mainly after 1am. Mostly cloudy, with a low around 62. Calm wind.
Sunday
A chance of showers, with thunderstorms also possible after 10am. Mostly cloudy, with a high near 80. Chance of precipitation is 50%.
Sunday Night
A 20 percent chance of showers after 1am. Mostly cloudy, with a low around 63.
Memorial Day
A 30 percent chance of showers and thunderstorms, mainly before 1pm. Partly sunny, with a high near 83.
Monday Night
A 20 percent chance of showers after 1am. Mostly cloudy, with a low around 64.
Tuesday
A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 83.
Tuesday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 66.
Wednesday
A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 85.
Wednesday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 67.
Thursday
A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 87.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Pontoon Beach IL
 38.73°N 90.06°W (Elev. 423 ft)
Last Update:
10:31 pm CDT May 21, 2026
Forecast Valid:
11pm 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