May in Hannover averages a daily high of 18.7°C with nights around 7.8°C. Expect roughly 11.9 wet days totalling 52mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Hannover is May–September.
Based on HANNOVER, GM (11.2km), 1995–2024. 30 years of May data.