In May, the weather in Trincomalee is typically hot. Average daily high temperature in May is about 33 degrees above zero. On average, Trincomalee has 17 rainy, 8 cloudy, 4 sunny, and 2 partly cloudy days in May. The rains are usually moderate. May as well as January, April, August, and September is considered the most uncomfortable time to visit Trincomalee.