July in Altona averages a daily high of 23.5°C with nights around 13.9°C. Expect roughly 14.7 wet days totalling 82mm. 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 July data.