May in Dartmouth averages a daily high of 13.5°C with nights around 4.9°C. Expect roughly 12.3 wet days totalling 128.2mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Dartmouth is June–September.
Based on SHEARWATER A, NS CA (7.4km), 1995–2024. 10 years of May data.