May in Rostock averages a daily high of 16.4°C with nights around 9.1°C. Expect roughly 11 wet days totalling 51.7mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Rostock is June–September.
Based on ROSTOCK WARNEMUNDE, GM (11km), 1995–2024. 30 years of May data.