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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.

Fair

70°F

21°C

Humidity 88%
Wind Speed S 9 mph
Barometer 29.86 in
Dewpoint 66°F (19°C)
Visibility 10.00 mi
Last update 16 May 5:50 pm CDT
Extended Forecast for

Pontoon Beach IL

  • Tonight

    Tonight: A 30 percent chance of showers and thunderstorms, mainly before 7pm. Mostly cloudy, with a low around 66. Southeast wind 7 to 9 mph.

    Low: 66 °F

    Chance
    T-storms then
    Mostly Cloudy

  • Sunday

    Sunday: Mostly cloudy through mid morning, then gradual clearing, with a high near 87. Breezy, with a south wind 10 to 20 mph, with gusts as high as 29 mph.

    High: 87 °F

    Mostly Sunny
    then Sunny
    and Breezy

  • Sunday Night

    Sunday Night: Increasing clouds, with a low around 71. South wind 13 to 17 mph, with gusts as high as 25 mph.

    Low: 71 °F

    Increasing
    Clouds

  • Monday

    Monday: A slight chance of showers before 10am, then a slight chance of showers and thunderstorms between 10am and 1pm, then showers likely and possibly a thunderstorm after 1pm. Partly sunny, with a high near 89. South wind 15 to 18 mph, with gusts as high as 26 mph. Chance of precipitation is 60%.

    High: 89 °F

    Slight Chance
    T-storms then
    Showers
    Likely

  • Monday Night

    Monday Night: A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 72. South wind 14 to 17 mph, with gusts as high as 25 mph.

    Low: 72 °F

    Chance
    Showers

  • Tuesday

    Tuesday: Showers and possibly a thunderstorm. High near 89. Chance of precipitation is 90%.

    High: 89 °F

    Showers
    Likely then
    T-storms

  • Tuesday Night

    Tuesday Night: Showers and possibly a thunderstorm before 1am, then a chance of showers and thunderstorms after 1am. Low around 61. Chance of precipitation is 80%.

    Low: 61 °F

    Showers

  • Wednesday

    Wednesday: A 20 percent chance of showers and thunderstorms before 1pm. Mostly cloudy, with a high near 72.

    High: 72 °F

    Slight Chance
    T-storms

  • Wednesday Night

    Wednesday Night: A 20 percent chance of showers. Mostly cloudy, with a low around 53.

    Low: 53 °F

    Slight Chance
    Showers

Detailed Forecast

Tonight
A 30 percent chance of showers and thunderstorms, mainly before 7pm. Mostly cloudy, with a low around 66. Southeast wind 7 to 9 mph.
Sunday
Mostly cloudy through mid morning, then gradual clearing, with a high near 87. Breezy, with a south wind 10 to 20 mph, with gusts as high as 29 mph.
Sunday Night
Increasing clouds, with a low around 71. South wind 13 to 17 mph, with gusts as high as 25 mph.
Monday
A slight chance of showers before 10am, then a slight chance of showers and thunderstorms between 10am and 1pm, then showers likely and possibly a thunderstorm after 1pm. Partly sunny, with a high near 89. South wind 15 to 18 mph, with gusts as high as 26 mph. Chance of precipitation is 60%.
Monday Night
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 72. South wind 14 to 17 mph, with gusts as high as 25 mph.
Tuesday
Showers and possibly a thunderstorm. High near 89. Chance of precipitation is 90%.
Tuesday Night
Showers and possibly a thunderstorm before 1am, then a chance of showers and thunderstorms after 1am. Low around 61. Chance of precipitation is 80%.
Wednesday
A 20 percent chance of showers and thunderstorms before 1pm. Mostly cloudy, with a high near 72.
Wednesday Night
A 20 percent chance of showers. Mostly cloudy, with a low around 53.
Thursday
Partly sunny, with a high near 72.
Thursday Night
A 20 percent chance of showers. Mostly cloudy, with a low around 54.
Friday
A 20 percent chance of showers. Partly sunny, with a high near 76.
Friday Night
A 20 percent chance of showers. Mostly cloudy, with a low around 58.
Saturday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 82.
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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:
3:57 pm CDT May 16, 2026
Forecast Valid:
6pm CDT May 16, 2026-6pm CDT May 23, 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