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.

Fair

69°F

21°C

Humidity 46%
Wind Speed SW 9 mph
Barometer 30.03 in
Dewpoint 47°F (8°C)
Visibility 10.00 mi
Last update 21 Apr 11:55 pm CDT
Extended Forecast for

Pontoon Beach IL

  • Overnight

    Overnight: Mostly clear, with a low around 58. Southwest wind around 8 mph.

    Low: 58 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 79. Southwest wind 6 to 10 mph.

    High: 79 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 57. South wind around 6 mph.

    Low: 57 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 82. Breezy, with a south wind 7 to 12 mph increasing to 15 to 20 mph in the afternoon. Winds could gust as high as 28 mph.

    High: 82 °F

    Sunny then
    Mostly Sunny
    and Breezy

  • Thursday Night

    Thursday Night: Showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 64. South wind 10 to 16 mph, with gusts as high as 24 mph. Chance of precipitation is 60%.

    Low: 64 °F

    Partly Cloudy
    then Showers
    Likely

  • Friday

    Friday: Showers and possibly a thunderstorm. High near 78. Chance of precipitation is 80%.

    High: 78 °F

    Showers

  • Friday Night

    Friday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 56. Chance of precipitation is 40%.

    Low: 56 °F

    Chance
    T-storms

  • Saturday

    Saturday: A 20 percent chance of showers before 1pm. Mostly sunny, with a high near 76.

    High: 76 °F

    Slight Chance
    Showers

  • Saturday Night

    Saturday Night: A 20 percent chance of showers after 1am. Partly cloudy, with a low around 53.

    Low: 53 °F

    Partly Cloudy
    then Slight
    Chance
    Showers

Detailed Forecast

Overnight
Mostly clear, with a low around 58. Southwest wind around 8 mph.
Wednesday
Sunny, with a high near 79. Southwest wind 6 to 10 mph.
Wednesday Night
Mostly clear, with a low around 57. South wind around 6 mph.
Thursday
Sunny, with a high near 82. Breezy, with a south wind 7 to 12 mph increasing to 15 to 20 mph in the afternoon. Winds could gust as high as 28 mph.
Thursday Night
Showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 64. South wind 10 to 16 mph, with gusts as high as 24 mph. Chance of precipitation is 60%.
Friday
Showers and possibly a thunderstorm. High near 78. Chance of precipitation is 80%.
Friday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 56. Chance of precipitation is 40%.
Saturday
A 20 percent chance of showers before 1pm. Mostly sunny, with a high near 76.
Saturday Night
A 20 percent chance of showers after 1am. Partly cloudy, with a low around 53.
Sunday
A 20 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 77.
Sunday Night
Showers and thunderstorms likely. Mostly cloudy, with a low around 60. Chance of precipitation is 60%.
Monday
Showers likely and possibly a thunderstorm. Partly sunny, with a high near 78. Chance of precipitation is 60%.
Monday Night
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 53.
Tuesday
Mostly sunny, with a high near 72.
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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:
9:01 pm CDT Apr 21, 2026
Forecast Valid:
12am CDT Apr 22, 2026-6pm CDT Apr 28, 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