December in Xiamen is the sunniest month of the year. In December, the weather in Xiamen is typically warm. Average daily high temperature in December is about 17 degrees above zero. On average, Xiamen has 12 partly cloudy, 9 cloudy, 8 sunny, and 2 rainy days in December. The rains are usually heavy. December as well as October and November is considered the most comfortable time to visit Xiamen.