September in Sukabumi is the warmest month of the year. In September, the weather in Sukabumi is typically warm. Average daily high temperature in September is about 26 degrees above zero. On average, Sukabumi has 28 rainy and 2 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 Sukabumi.