March in Isulan is the cloudiest and the hottest month of the year. In March, the weather in Isulan is typically hot. Average daily high temperature in March is about 29 degrees above zero. On average, Isulan has 30 rainy and 1 cloudy day in March. The rains are usually heavy. March as well as January, February, April, and May is considered the most uncomfortable time to visit Isulan.