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

Hazardous Weather Conditions

Current conditions at

St. Louis Downtown Airport (KCPS)

Lat: 38.56°NLon: 90.15°WElev: 410ft.

A Few Clouds

78°F

26°C

Humidity 87%
Wind Speed Calm
Barometer 29.92 in (1012.6 mb)
Dewpoint 74°F (23°C)
Visibility 10.00 mi
Heat Index80°F (27°C)
Last update 17 Jul 12:53 am CDT
Extended Forecast for

Pontoon Beach IL

  • Overnight

    Overnight: A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 75. Light west wind.

    Low: 75 °F

    Slight Chance
    T-storms

  • Thursday

    Thursday: A 50 percent chance of showers and thunderstorms, mainly after 2pm. Mostly cloudy, with a high near 86. Light and variable wind becoming north around 6 mph in the morning.

    High: 86 °F

    Slight Chance
    T-storms then
    Chance
    T-storms

  • Thursday Night

    Thursday Night: A 30 percent chance of showers and thunderstorms, mainly before 10pm. Mostly cloudy, with a low around 70. Northeast wind around 5 mph becoming calm in the evening.

    Low: 70 °F

    Chance
    T-storms

  • Friday

    Friday: Showers likely and possibly a thunderstorm before 4pm, then showers and thunderstorms likely after 4pm. Partly sunny, with a high near 87. Light and variable wind becoming southeast around 6 mph in the morning. Chance of precipitation is 60%.

    High: 87 °F

    Showers
    Likely then
    T-storms
    Likely

  • Friday Night

    Friday Night: Showers and thunderstorms likely, mainly before 7pm. Mostly cloudy, with a low around 74. South wind 3 to 6 mph. Chance of precipitation is 60%.

    Low: 74 °F

    T-storms
    Likely then
    Chance
    T-storms

  • Saturday

    Saturday: A 40 percent chance of showers and thunderstorms. Mostly sunny, with a high near 93.

    High: 93 °F

    Chance
    T-storms

  • Saturday Night

    Saturday Night: A slight chance of showers and thunderstorms. Partly cloudy, with a low around 76. Chance of precipitation is 20%.

    Low: 76 °F

    Slight Chance
    T-storms

  • Sunday

    Sunday: A 40 percent chance of showers and thunderstorms. Mostly sunny, with a high near 94.

    High: 94 °F

    Chance
    T-storms

  • Sunday Night

    Sunday Night: A 30 percent chance of showers and thunderstorms, mainly before 1am. Partly cloudy, with a low around 76.

    Low: 76 °F

    Chance
    T-storms

Detailed Forecast

Overnight
A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 75. Light west wind.
Thursday
A 50 percent chance of showers and thunderstorms, mainly after 2pm. Mostly cloudy, with a high near 86. Light and variable wind becoming north around 6 mph in the morning.
Thursday Night
A 30 percent chance of showers and thunderstorms, mainly before 10pm. Mostly cloudy, with a low around 70. Northeast wind around 5 mph becoming calm in the evening.
Friday
Showers likely and possibly a thunderstorm before 4pm, then showers and thunderstorms likely after 4pm. Partly sunny, with a high near 87. Light and variable wind becoming southeast around 6 mph in the morning. Chance of precipitation is 60%.
Friday Night
Showers and thunderstorms likely, mainly before 7pm. Mostly cloudy, with a low around 74. South wind 3 to 6 mph. Chance of precipitation is 60%.
Saturday
A 40 percent chance of showers and thunderstorms. Mostly sunny, with a high near 93.
Saturday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 76. Chance of precipitation is 20%.
Sunday
A 40 percent chance of showers and thunderstorms. Mostly sunny, with a high near 94.
Sunday Night
A 30 percent chance of showers and thunderstorms, mainly before 1am. Partly cloudy, with a low around 76.
Monday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 96.
Monday Night
Mostly clear, with a low around 78.
Tuesday
Sunny and hot, with a high near 98.
Tuesday Night
Mostly clear, with a low around 78.
Wednesday
Sunny and hot, with a high near 97.
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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:
1:21 am CDT Jul 17, 2025
Forecast Valid:
1am CDT Jul 17, 2025-6pm CDT Jul 23, 2025
 
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