September in Banjarmasin is the windiest month of the year. In September, the weather in Banjarmasin is typically hot. Average daily high temperature in September is about 31 degrees above zero. On average, Banjarmasin has 16 rainy, 5 sunny, 5 partly cloudy, and 4 cloudy days in September. The rains are usually heavy. September as well as January, February, March, and April is considered the most uncomfortable time to visit Banjarmasin.