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.

Overcast

16°F

-9°C

Humidity 62%
Wind Speed NW 12 mph
Barometer 30.56 in
Dewpoint 5°F (-15°C)
Visibility 10.00 mi
Wind Chill3°F (-16°C)
Last update 23 Feb 6:50 am CST
Extended Forecast for

Pontoon Beach IL

  • Today

    Today: Mostly cloudy through mid morning, then gradual clearing, with a high near 31. Northwest wind 6 to 15 mph, with gusts as high as 23 mph.

    High: 31 °F

    Becoming
    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 20. Calm wind becoming south 5 to 8 mph after midnight.

    Low: 20 °F

    Mostly Clear

  • Tuesday

    Tuesday: Partly sunny, with a high near 52. Breezy, with a south wind 11 to 21 mph, with gusts as high as 31 mph.

    High: 52 °F

    Partly Sunny
    and Breezy

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 34. Southwest wind 5 to 14 mph becoming northwest after midnight.

    Low: 34 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 52. Northwest wind around 6 mph becoming southeast in the afternoon.

    High: 52 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: A slight chance of rain, then rain likely and possibly a thunderstorm after midnight. Mostly cloudy, with a low around 36. Chance of precipitation is 60%.

    Low: 36 °F

    Slight Chance
    Rain then
    Rain Likely

  • Thursday

    Thursday: A 40 percent chance of rain before noon. Partly sunny, with a high near 48.

    High: 48 °F

    Chance Rain
    then Mostly
    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 30.

    Low: 30 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 61.

    High: 61 °F

    Sunny

Detailed Forecast

Today
Mostly cloudy through mid morning, then gradual clearing, with a high near 31. Northwest wind 6 to 15 mph, with gusts as high as 23 mph.
Tonight
Mostly clear, with a low around 20. Calm wind becoming south 5 to 8 mph after midnight.
Tuesday
Partly sunny, with a high near 52. Breezy, with a south wind 11 to 21 mph, with gusts as high as 31 mph.
Tuesday Night
Mostly cloudy, with a low around 34. Southwest wind 5 to 14 mph becoming northwest after midnight.
Wednesday
Mostly sunny, with a high near 52. Northwest wind around 6 mph becoming southeast in the afternoon.
Wednesday Night
A slight chance of rain, then rain likely and possibly a thunderstorm after midnight. Mostly cloudy, with a low around 36. Chance of precipitation is 60%.
Thursday
A 40 percent chance of rain before noon. Partly sunny, with a high near 48.
Thursday Night
Mostly clear, with a low around 30.
Friday
Sunny, with a high near 61.
Friday Night
Clear, with a low around 39.
Saturday
Mostly sunny, with a high near 64.
Saturday Night
A 20 percent chance of rain. Mostly cloudy, with a low around 35.
Sunday
A 30 percent chance of rain. Partly sunny, with a high near 50.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Pontoon Beach IL
 38.73°N 90.06°W (Elev. 423 ft)
Last Update:
5:31 am CST Feb 23, 2026
Forecast Valid:
7am CST Feb 23, 2026-6pm CST Mar 1, 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