With a population of around 20,900, Acton sits in Massachusetts, United States. The city operates in the Eastern Time Zone.
In 2025, Acton recorded an average annual temperature of 50°F — about 0.8°F above the 30-year normal of 49°F. The hottest day reached 98°F in June; the coldest was -3°F in January. Total precipitation was 43 inches (near normal). The wettest month was May.
View current conditions and forecast for Acton · More cities in Massachusetts