December in Sanya averages a daily high of 25.1°C with nights around 16.7°C. Expect roughly 4.3 wet days totalling 17.3mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Sanya is November–March.
Based on SANYA, CH (8.8km), 1995–2024. 26 years of December data.