July in Weymouth averages a daily high of 28.5°C with nights around 17.7°C. Expect roughly 10.7 wet days totalling 103.7mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Weymouth is May–September.
Based on HINGHAM, MA US (2.3km), 1995–2024. 30 years of July data.