With a population of around 13,100, Harwich sits in Massachusetts, United States. The city operates in the Eastern Time Zone.
In 2025, Harwich recorded an average annual temperature of 52°F — about 0.6°F above the 30-year normal of 51°F. The hottest day reached 89°F in June; the coldest was 17°F in March. Total precipitation was 44 inches (near normal). The wettest month was October.
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