May in Xiamen averages a daily high of 27.5°C with nights around 20.7°C. Expect roughly 13.1 wet days totalling 178.9mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Xiamen is October–December.
Based on XIAMEN, CH (0.4km), 1995–2024. 18 years of May data.