May in Ann Arbor averages a daily high of 21.7°C with nights around 7.9°C. Expect roughly 14.6 wet days totalling 100mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Ann Arbor is May–June.
Based on ANN ARBOR SE, MI US (5.6km), 1995–2024. 22 years of May data.