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.

Fair

91°F

33°C

Humidity 32%
Wind Speed Vrbl 6 mph
Barometer 29.96 in
Dewpoint 57°F (14°C)
Visibility 10.00 mi
Heat Index90°F (32°C)
Last update 18 Sep 4:50 pm CDT
Extended Forecast for

Pontoon Beach IL

  • Tonight

    Tonight: Isolated showers and thunderstorms between 1am and 4am, then isolated showers after 4am. Increasing clouds, with a low around 66. East wind around 6 mph becoming light and variable after midnight. Chance of precipitation is 20%.

    Low: 66 °F

    Partly Cloudy
    then Isolated
    T-storms

  • Friday

    Friday: Isolated showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 85. North wind around 6 mph becoming west in the afternoon. Chance of precipitation is 20%.

    High: 85 °F

    Isolated
    Showers then
    Isolated
    T-storms

  • Friday Night

    Friday Night: Scattered showers and thunderstorms before 4am, then a slight chance of showers. Partly cloudy, with a low around 64. Light and variable wind. Chance of precipitation is 30%.

    Low: 64 °F

    Scattered
    T-storms then
    Chance
    Showers

  • Saturday

    Saturday: A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 88. Calm wind becoming southwest around 6 mph in the afternoon.

    High: 88 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

  • Saturday Night

    Saturday Night: A 30 percent chance of showers and thunderstorms, mainly after 1am. Mostly cloudy, with a low around 67. Light and variable wind.

    Low: 67 °F

    Chance
    T-storms

  • Sunday

    Sunday: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Partly sunny, with a high near 86. Chance of precipitation is 60%.

    High: 86 °F

    Showers
    Likely

  • Sunday Night

    Sunday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 66. Chance of precipitation is 70%.

    Low: 66 °F

    Chance
    T-storms then
    Showers
    Likely

  • Monday

    Monday: A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 86.

    High: 86 °F

    Chance
    Showers then
    Chance
    T-storms

  • Monday Night

    Monday Night: A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 65.

    Low: 65 °F

    Chance
    T-storms

Detailed Forecast

Tonight
Isolated showers and thunderstorms between 1am and 4am, then isolated showers after 4am. Increasing clouds, with a low around 66. East wind around 6 mph becoming light and variable after midnight. Chance of precipitation is 20%.
Friday
Isolated showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 85. North wind around 6 mph becoming west in the afternoon. Chance of precipitation is 20%.
Friday Night
Scattered showers and thunderstorms before 4am, then a slight chance of showers. Partly cloudy, with a low around 64. Light and variable wind. Chance of precipitation is 30%.
Saturday
A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 88. Calm wind becoming southwest around 6 mph in the afternoon.
Saturday Night
A 30 percent chance of showers and thunderstorms, mainly after 1am. Mostly cloudy, with a low around 67. Light and variable wind.
Sunday
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Partly sunny, with a high near 86. Chance of precipitation is 60%.
Sunday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 66. Chance of precipitation is 70%.
Monday
A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 86.
Monday Night
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 65.
Tuesday
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 81.
Tuesday Night
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 63.
Wednesday
A 30 percent chance of showers. Partly sunny, with a high near 78.
Wednesday Night
A 30 percent chance of showers. Mostly cloudy, with a low around 60.
Thursday
A 30 percent chance of showers. Mostly sunny, with a high near 79.
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ABOUT THIS FORECAST

 
Point Forecast:
Pontoon Beach IL
 38.73°N 90.06°W (Elev. 423 ft)
Last Update:
4:06 pm CDT Sep 18, 2025
Forecast Valid:
5pm CDT Sep 18, 2025-6pm CDT Sep 25, 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