May in Sintang is the hottest month of the year. In May, the weather in Sintang is typically hot. Average daily high temperature in May is about 31 degrees above zero. On average, Sintang has 26 rainy, 4 cloudy, and 1 partly cloudy day in May. The rains are usually heavy. May as well as January, February, March, and April is considered the most uncomfortable time to visit Sintang.