March in Nakhon Si Thammarat is the sunniest month of the year. In March, the weather in Nakhon Si Thammarat is typically hot. Average daily high temperature in March is about 30 degrees above zero. On average, Nakhon Si Thammarat has 12 rainy, 9 sunny, 7 partly cloudy, and 3 cloudy days in March. The rains are usually heavy.