October in Trincomalee is the rainiest month of the year. In October, the weather in Trincomalee is typically hot. Average daily high temperature in October is about 30 degrees above zero. On average, Trincomalee has 27 rainy, 3 sunny, and 1 cloudy day in October. The rains are usually heavy. October as well as January, April, May, and August is considered the most uncomfortable time to visit Trincomalee.