National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce
Current conditions at

St. Louis Regional Airport (KALN)

Lat: 38.89°NLon: 90.03°WElev: 518ft.

Fog/Mist

37°F

3°C

Humidity 89%
Wind Speed S 5 mph
Barometer 29.93 in
Dewpoint 34°F (1°C)
Visibility 5.00 mi
Wind Chill33°F (1°C)
Last update 7 Dec 4:55 am CST
Extended Forecast for

Pontoon Beach IL

  • Overnight

    Overnight: A chance of sprinkles. Mostly cloudy, with a low around 37. Light south wind.

    Low: 37 °F

    Chance
    Sprinkles

  • Sunday

    Sunday: A chance of sprinkles and flurries before 7am, then a chance of sprinkles between 7am and 11am. Cloudy, with a high near 40. Light and variable wind becoming north 9 to 14 mph in the morning. Winds could gust as high as 22 mph.

    High: 40 °F

    Chance
    Sprinkles/Flurries
    then Cloudy

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 22. North wind 7 to 11 mph, with gusts as high as 20 mph.

    Low: 22 °F

    Mostly Cloudy

  • Monday

    Monday: Mostly cloudy, then gradually becoming sunny, with a high near 34. North wind around 5 mph becoming calm in the morning.

    High: 34 °F

    Decreasing
    Clouds

  • Monday Night

    Monday Night: Partly cloudy, with a low around 25. Calm wind becoming south 5 to 9 mph in the evening.

    Low: 25 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 52.

    High: 52 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 41.

    Low: 41 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 49.

    High: 49 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: A 20 percent chance of snow after midnight. Mostly cloudy, with a low around 27.

    Low: 27 °F

    Mostly Cloudy
    then Slight
    Chance Snow

Detailed Forecast

Overnight
A chance of sprinkles. Mostly cloudy, with a low around 37. Light south wind.
Sunday
A chance of sprinkles and flurries before 7am, then a chance of sprinkles between 7am and 11am. Cloudy, with a high near 40. Light and variable wind becoming north 9 to 14 mph in the morning. Winds could gust as high as 22 mph.
Sunday Night
Mostly cloudy, with a low around 22. North wind 7 to 11 mph, with gusts as high as 20 mph.
Monday
Mostly cloudy, then gradually becoming sunny, with a high near 34. North wind around 5 mph becoming calm in the morning.
Monday Night
Partly cloudy, with a low around 25. Calm wind becoming south 5 to 9 mph in the evening.
Tuesday
Mostly sunny, with a high near 52.
Tuesday Night
Mostly cloudy, with a low around 41.
Wednesday
Partly sunny, with a high near 49.
Wednesday Night
A 20 percent chance of snow after midnight. Mostly cloudy, with a low around 27.
Thursday
A chance of rain and snow, mainly before noon. Mostly cloudy, with a high near 38. Chance of precipitation is 30%.
Thursday Night
Mostly cloudy, with a low around 17.
Friday
Mostly sunny, with a high near 26.
Friday Night
Mostly cloudy, with a low around 6.
Saturday
Partly sunny, with a high near 22.
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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:
5:01 am CST Dec 7, 2025
Forecast Valid:
5am CST Dec 7, 2025-6pm CST Dec 13, 2025
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation