May in Nanaimo averages a daily high of 15.4°C with nights around 10.2°C. Expect roughly 11.2 wet days totalling 43.5mm. 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 May data.