May in Delta averages a daily high of 17.4°C with nights around 9.8°C. Expect roughly 9.5 wet days totalling 47mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Delta is June–August.
Based on DELTA TSAWWASSEN BEACH, BC CA (8.7km), 1995–2024. 26 years of May data.