January in Altona averages a daily high of 4.5°C with nights around 0°C. Expect roughly 16.8 wet days totalling 67.3mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Altona is May–September.
Based on HAMBURG NEUWIEDENTHAL, GM (8.2km), 1995–2024. 30 years of January data.