May in Buffalo averages a daily high of 18.9°C with nights around 7.7°C. Expect roughly 12.4 wet days totalling 96.4mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Buffalo is June–September.
Based on FORT ERIE, ON CA (7.2km), 1995–2024. 22 years of May data.