May in Detroit averages a daily high of 21.2°C with nights around 10.3°C. Expect roughly 13.1 wet days totalling 90.4mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Detroit is August–September.
Based on DETROIT CITY AIRPORT, MI US (9km), 1995–2024. 29 years of May data.