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

St. Louis Downtown Airport (KCPS)

Lat: 38.56°NLon: 90.15°WElev: 410ft.

Fair

81°F

27°C

Humidity 41%
Wind Speed N 8 mph
Barometer 30.14 in (1020.5 mb)
Dewpoint 55°F (13°C)
Visibility 10.00 mi
Heat Index81°F (27°C)
Last update 23 Jun 3:53 pm CDT
Extended Forecast for

Pontoon Beach IL

  • Tonight

    Tonight: Increasing clouds, with a low around 63. Northeast wind around 5 mph becoming calm in the evening.

    Low: 63 °F

    Increasing
    Clouds

  • Wednesday

    Wednesday: A 30 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 84. Light and variable wind becoming south 5 to 8 mph in the morning.

    High: 84 °F

    Mostly Sunny
    then Chance
    T-storms

  • Wednesday Night

    Wednesday Night: A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 67. Southwest wind around 5 mph becoming calm in the evening.

    Low: 67 °F

    Slight Chance
    T-storms

  • Thursday

    Thursday: Showers and thunderstorms likely, mainly after 1pm. Some of the storms could produce heavy rainfall. Partly sunny, with a high near 86. Calm wind becoming south around 5 mph in the afternoon. Chance of precipitation is 70%.

    High: 86 °F

    Chance
    T-storms then
    Heavy Rain

  • Thursday Night

    Thursday Night: Showers and thunderstorms. Low around 68. Southeast wind around 5 mph becoming calm in the evening. Chance of precipitation is 80%.

    Low: 68 °F

    T-storms

  • Friday

    Friday: Showers and thunderstorms. High near 84. Chance of precipitation is 80%.

    High: 84 °F

    T-storms

  • Friday Night

    Friday Night: Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 70. Chance of precipitation is 60%.

    Low: 70 °F

    Showers
    Likely

  • Saturday

    Saturday: A 30 percent chance of showers and thunderstorms, mainly before 1pm. Partly sunny, with a high near 90.

    High: 90 °F

    Chance
    Showers

  • Saturday Night

    Saturday Night: A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 73.

    Low: 73 °F

    Slight Chance
    T-storms

Detailed Forecast

Tonight
Increasing clouds, with a low around 63. Northeast wind around 5 mph becoming calm in the evening.
Wednesday
A 30 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 84. Light and variable wind becoming south 5 to 8 mph in the morning.
Wednesday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 67. Southwest wind around 5 mph becoming calm in the evening.
Thursday
Showers and thunderstorms likely, mainly after 1pm. Some of the storms could produce heavy rainfall. Partly sunny, with a high near 86. Calm wind becoming south around 5 mph in the afternoon. Chance of precipitation is 70%.
Thursday Night
Showers and thunderstorms. Low around 68. Southeast wind around 5 mph becoming calm in the evening. Chance of precipitation is 80%.
Friday
Showers and thunderstorms. High near 84. Chance of precipitation is 80%.
Friday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 70. Chance of precipitation is 60%.
Saturday
A 30 percent chance of showers and thunderstorms, mainly before 1pm. Partly sunny, with a high near 90.
Saturday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 73.
Sunday
Sunny, with a high near 94.
Sunday Night
Mostly clear, with a low around 76.
Monday
Sunny, with a high near 96.
Monday Night
Mostly clear, with a low around 78.
Tuesday
Sunny, with a high near 96.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Pontoon Beach IL
 38.73°N 90.09°W (Elev. 417 ft)
Last Update:
9:46 am CDT Jun 23, 2026
Forecast Valid:
4pm CDT Jun 23, 2026-6pm CDT Jun 30, 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