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

38°F

3°C

Humidity 96%
Wind Speed S 3 mph
Barometer 30.03 in
Dewpoint 37°F (3°C)
Visibility 0.50 mi
Last update 16 Feb 2:55 am CST
Extended Forecast for

Pontoon Beach IL

  • Overnight

    Overnight: Mostly clear, with a steady temperature around 43. Light south wind.

    Low: 43 °F

    Mostly Clear

  • Washington's Birthday

    Washington's Birthday: Mostly sunny, with a high near 65. Light south wind increasing to 6 to 11 mph in the morning.

    High: 65 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 43. South wind 6 to 8 mph.

    Low: 43 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 64. South wind 7 to 12 mph increasing to 13 to 18 mph in the afternoon. Winds could gust as high as 28 mph.

    High: 64 °F

    Mostly Cloudy

  • Tuesday Night

    Tuesday Night: A 20 percent chance of showers after midnight. Mostly cloudy, with a low around 57. Breezy, with a southwest wind 16 to 20 mph, with gusts as high as 31 mph.

    Low: 57 °F

    Mostly Cloudy
    and Breezy
    then Slight
    Chance
    Showers

  • Wednesday

    Wednesday: Sunny, with a high near 71.

    High: 71 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 47.

    Low: 47 °F

    Partly Cloudy

  • Thursday

    Thursday: A slight chance of showers, then a chance of showers and thunderstorms after noon. Mostly sunny, with a high near 72. Chance of precipitation is 30%.

    High: 72 °F

    Chance
    Showers

  • Thursday Night

    Thursday Night: A 20 percent chance of showers before midnight. Mostly clear, with a low around 39.

    Low: 39 °F

    Slight Chance
    Showers then
    Mostly Clear

Detailed Forecast

Overnight
Mostly clear, with a steady temperature around 43. Light south wind.
Washington's Birthday
Mostly sunny, with a high near 65. Light south wind increasing to 6 to 11 mph in the morning.
Monday Night
Partly cloudy, with a low around 43. South wind 6 to 8 mph.
Tuesday
Mostly cloudy, with a high near 64. South wind 7 to 12 mph increasing to 13 to 18 mph in the afternoon. Winds could gust as high as 28 mph.
Tuesday Night
A 20 percent chance of showers after midnight. Mostly cloudy, with a low around 57. Breezy, with a southwest wind 16 to 20 mph, with gusts as high as 31 mph.
Wednesday
Sunny, with a high near 71.
Wednesday Night
Partly cloudy, with a low around 47.
Thursday
A slight chance of showers, then a chance of showers and thunderstorms after noon. Mostly sunny, with a high near 72. Chance of precipitation is 30%.
Thursday Night
A 20 percent chance of showers before midnight. Mostly clear, with a low around 39.
Friday
Mostly sunny, with a high near 51.
Friday Night
A 20 percent chance of showers. Partly cloudy, with a low around 32.
Saturday
A 30 percent chance of showers. Partly sunny, with a high near 49.
Saturday Night
A 30 percent chance of showers. Partly cloudy, with a low around 29.
Sunday
A 20 percent chance of showers. Mostly sunny, with a high near 42.
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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:
3:01 am CST Feb 16, 2026
Forecast Valid:
3am CST Feb 16, 2026-6pm CST Feb 22, 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