September in Xiamen averages a daily high of 30.7°C with nights around 24.1°C. Expect roughly 8.3 wet days totalling 127.2mm. 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 September data.