December in Phuket averages a daily high of 31.9°C with nights around 25.1°C. Expect roughly 9.7 wet days totalling 64.4mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Phuket is January–February.
Based on PHUKET, TH (0.9km), 1995–2024. 19 years of December data.