December in Cha Am is the windiest and the coldest month of the year. In December, the weather in Cha Am is typically hot. Average daily high temperature in December is about 28 degrees above zero. On average, Cha Am has 19 partly cloudy, 10 sunny, 1 rainy, and 1 cloudy day in December. The rains are usually light. December as well as January is considered the most comfortable time to visit Cha Am.