January in Trincomalee is the coldest month of the year. In January, the weather in Trincomalee is typically warm. Average daily high temperature in January is about 27 degrees above zero. On average, Trincomalee has 20 rainy, 9 sunny, and 2 partly cloudy days in January. The rains are usually heavy. January as well as April, May, August, and September is considered the most uncomfortable time to visit Trincomalee.