May in Rochester averages a daily high of 20.1°C with nights around 8.5°C. Expect roughly 13.3 wet days totalling 114mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Rochester is June–September.
Based on ROCHESTER INTERNATIONAL AIRPORT, MN US (13.2km), 1995–2024. 30 years of May data.