With a population of around 4,600, South Barrington sits in Illinois, United States. The city operates in the Central Time Zone.
In 2025, South Barrington recorded an average annual temperature of 50°F — about 0.9°F below the 30-year normal of 51°F. The hottest day reached 93°F in June; the coldest was -10°F in February. Total precipitation was 35 inches (wetter than usual). The wettest month was June.
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