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

Hazardous Weather Conditions

Current conditions at

St. Louis Regional Airport (KALN)

Lat: 38.89°NLon: 90.03°WElev: 518ft.

Mostly Cloudy

81°F

27°C

Humidity 79%
Wind Speed SW 10 mph
Barometer 29.72 in
Dewpoint 73°F (23°C)
Visibility 10.00 mi
Heat Index86°F (30°C)
Last update 21 Jun 3:50 pm CDT
Extended Forecast for

Pontoon Beach IL

Flood Watch June 21, 04:49pm until June 22, 01:00am
Tornado Watch until June 21, 09:00pm
Click here for hazard details and duration
Flood Watch
Tornado Watch
  •  
    Flood Watch June 21, 04:49pm until June 22, 01:00am
    Tornado Watch until June 21, 09:00pm

    NOW: Multiple hazards in effect

    Click HERE for Details

  • This Afternoon

    High: 80 °F

    Scattered
    T-storms

  • Tonight

    Tonight: Scattered showers and thunderstorms, mainly before 9pm. Mostly cloudy, with a low around 65. Southwest wind 7 to 10 mph becoming northwest after midnight. Winds could gust as high as 20 mph. Chance of precipitation is 40%.

    Low: 65 °F

    Scattered
    T-storms then
    Mostly Cloudy

  • Monday

    Monday: Cloudy, then gradually becoming mostly sunny, with a high near 77. North wind 9 to 11 mph.

    High: 77 °F

    Decreasing
    Clouds

  • Monday Night

    Monday Night: Mostly cloudy, then gradually becoming clear, with a low around 61. North wind 5 to 8 mph becoming calm in the evening.

    Low: 61 °F

    Decreasing
    Clouds

  • Tuesday

    Tuesday: Sunny, with a high near 82. Calm wind becoming east around 5 mph.

    High: 82 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 64.

    Low: 64 °F

    Mostly Clear

  • Wednesday

    Wednesday: A slight chance of showers, with thunderstorms also possible after 10am. Partly sunny, with a high near 85. Chance of precipitation is 20%.

    High: 85 °F

    Slight Chance
    T-storms

  • Wednesday Night

    Wednesday Night: A 30 percent chance of showers and thunderstorms, mainly after 1am. Partly cloudy, with a low around 68.

    Low: 68 °F

    Slight Chance
    T-storms then
    Chance
    Showers

Detailed Forecast

This Afternoon
Scattered showers and thunderstorms, mainly after 5pm. Cloudy, with a high near 80. South wind around 15 mph, with gusts as high as 24 mph. Chance of precipitation is 30%.
Tonight
Scattered showers and thunderstorms, mainly before 9pm. Mostly cloudy, with a low around 65. Southwest wind 7 to 10 mph becoming northwest after midnight. Winds could gust as high as 20 mph. Chance of precipitation is 40%.
Monday
Cloudy, then gradually becoming mostly sunny, with a high near 77. North wind 9 to 11 mph.
Monday Night
Mostly cloudy, then gradually becoming clear, with a low around 61. North wind 5 to 8 mph becoming calm in the evening.
Tuesday
Sunny, with a high near 82. Calm wind becoming east around 5 mph.
Tuesday Night
Mostly clear, with a low around 64.
Wednesday
A slight chance of showers, with thunderstorms also possible after 10am. Partly sunny, with a high near 85. Chance of precipitation is 20%.
Wednesday Night
A 30 percent chance of showers and thunderstorms, mainly after 1am. Partly cloudy, with a low around 68.
Thursday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 86.
Thursday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 67. Chance of precipitation is 20%.
Friday
A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 86.
Friday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 70.
Saturday
A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 89.
Saturday Night
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 73.
Sunday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 94. Breezy.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Pontoon Beach IL
 38.73°N 90.06°W (Elev. 423 ft)
Last Update:
1:26 pm CDT Jun 21, 2026
Forecast Valid:
4pm CDT Jun 21, 2026-6pm CDT Jun 28, 2026
 
Forecast Discussion
 
Get as KML Get as XML

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