May in Metz averages a daily high of 18.6°C with nights around 9°C. Expect roughly 12.7 wet days totalling 71.9mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Metz is June–September.
Based on BERUS, GM (40.8km), 1995–2024. 29 years of May data.