Marseilles, in Illinois, United States, is home to roughly 5,000 people in the Central Time Zone at 41.3°N latitude.
In 2025, Marseilles recorded an average annual temperature of 52°F — about 2.5°F above the 30-year normal of 49°F. The hottest day reached 92°F in June; the coldest was -9°F in January. Total precipitation was 35 inches (near normal). The wettest month was July.
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