September in Sampit is the windiest and the hottest month of the year. In September, the weather in Sampit is typically hot. Average daily high temperature in September is about 31 degrees above zero. On average, Sampit has 23 rainy, 3 sunny, 3 cloudy, and 1 partly cloudy day in September. The rains are usually heavy. September as well as January, February, March, and April is considered the most uncomfortable time to visit Sampit.