September in Kota Bharu is the cloudiest month of the year. In September, the weather in Kota Bharu is typically hot. Average daily high temperature in September is about 30 degrees above zero. On average, Kota Bharu has 30 rainy 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 Kota Bharu.