August in Dorchester averages a daily high of 28.4°C with nights around 17.2°C. Expect roughly 9.8 wet days totalling 94.8mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Dorchester is May–June.
Based on JAMAICA PLAIN, MA US (4.1km), 1995–2024. 24 years of August data.