May in Weymouth averages a daily high of 20.3°C with nights around 8.9°C. Expect roughly 13.2 wet days totalling 102mm. 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. 29 years of May data.