January in Nakhon Si Thammarat is the coldest month of the year. In January, the weather in Nakhon Si Thammarat is typically warm. Average daily high temperature in January is about 27 degrees above zero. On average, Nakhon Si Thammarat has 24 rainy, 4 sunny, 2 cloudy, and 1 partly cloudy day in January. The rains are usually heavy. January as well as April, May, June, and July is considered the most uncomfortable time to visit Nakhon Si Thammarat.