With a population of around 28,100, Suisun sits in California, United States. The city operates in the Pacific Time Zone.
In 2025, Suisun recorded an average annual temperature of 59°F — about 3.2°F below the 30-year normal of 62°F. The hottest day reached 98°F in August; the coldest was 33°F in January. Total precipitation was 23 inches (drier than usual). The wettest month was February.
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