December in Bremen averages a daily high of 5.4°C with nights around 0.5°C. Expect roughly 16.1 wet days totalling 59.8mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Bremen is May–September.
Based on BREMEN SEEFAHRTSCHULE, GM (3.3km), 1995–2024. 30 years of December data.