September in Dartmouth averages a daily high of 20.2°C with nights around 11.4°C. Expect roughly 9.3 wet days totalling 84.8mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Dartmouth is June–September.
Based on SHEARWATER A, NS CA (7.4km), 1995–2024. 11 years of September data.