September in Nanaimo averages a daily high of 17.4°C with nights around 13.2°C. Expect roughly 9.7 wet days totalling 51.3mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Nanaimo is July–August.
Based on ENTRANCE ISLAND, BC CA (10.6km), 1995–2024. 27 years of September data.