September in Rostock averages a daily high of 18.9°C with nights around 12.2°C. Expect roughly 11.5 wet days totalling 53.8mm. 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 September data.