September in Hannover averages a daily high of 19.8°C with nights around 10.1°C. Expect roughly 10.9 wet days totalling 54.2mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Hannover is May–September.
Based on HANNOVER, GM (11.2km), 1995–2024. 30 years of September data.