Pontoon Beach is a city of approximately 5,600 people in Illinois, United States. Located in the Central Time Zone at 38.7°N latitude.
In 2025, Pontoon Beach recorded an average annual temperature of 57°F — about 0.5°F above the 30-year normal of 57°F. The hottest day reached 96°F in July; the coldest was 0°F in January. Total precipitation was 43 inches (near normal). The wettest month was April.
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