January in Rayong is the coldest month of the year. In January, the weather in Rayong is typically hot. Average daily high temperature in January is about 28 degrees above zero. On average, Rayong has 15 partly cloudy, 10 sunny, 4 cloudy, and 2 rainy days in January. The rains are usually light. January as well as December is considered the most comfortable time to visit Rayong.