September in Harburg averages a daily high of 19.6°C with nights around 10.8°C. Expect roughly 12.6 wet days totalling 58.9mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Harburg is May–September.
Based on HAMBURG NEUWIEDENTHAL, GM (6km), 1995–2024. 30 years of September data.