May in Granby averages a daily high of 18.8°C with nights around 8.1°C. Expect roughly 12.8 wet days totalling 98.2mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Granby is May–September.
Based on GRANBY, QC CA (2.2km), 1995–2024. 27 years of May data.