May in Québec averages a daily high of 17.1°C with nights around 7.2°C. Expect roughly 14.1 wet days totalling 93.7mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Québec is June–September.
Based on BEAUPORT, QC CA (2.6km), 1995–2024. 14 years of May data.