August in Altona averages a daily high of 23.6°C with nights around 13.9°C. Expect roughly 13.9 wet days totalling 74.8mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Altona is May–September.
Based on HAMBURG NEUWIEDENTHAL, GM (8.2km), 1995–2024. 30 years of August data.