December in Hangzhou averages a daily high of 11.4°C with nights around 4.1°C. Expect roughly 8.3 wet days totalling 58.2mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Hangzhou is May.
Based on HANGZHOU, CH (6.8km), 1995–2024. 19 years of December data.