In April, the weather in Trincomalee is typically hot. Average daily high temperature in April is about 33 degrees above zero. On average, Trincomalee has 15 rainy, 7 sunny, 6 partly cloudy, and 2 cloudy days in April. The rains are usually heavy. April as well as May, August, September, and October is considered the most uncomfortable time to visit Trincomalee.