December in Zhoushan averages a daily high of 12.9°C with nights around 5.5°C. Expect roughly 9.6 wet days totalling 72.2mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Zhoushan is October.
Based on DINGHAI, CH (9.8km), 1995–2024. 26 years of December data.