May in Siquijor is the hottest month of the year. In May, the weather in Siquijor is typically hot. Average daily high temperature in May is about 29 degrees above zero. On average, Siquijor has 27 rainy and 4 sunny days in May. The rains are usually heavy. May as well as January, February, March, and June is considered the most uncomfortable time to visit Siquijor.