September in Welland averages a daily high of 22.5°C with nights around 11.4°C. Expect roughly 9.1 wet days totalling 81.8mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Welland is May–September.
Based on WELLAND PELHAM, ON CA (7.1km), 1995–2024. 16 years of September data.