July in Dorchester averages a daily high of 29.4°C with nights around 18.1°C. Expect roughly 11.7 wet days totalling 118.1mm. Generally workable, with some weather to plan around.
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 July data.