In September, the weather in Cam Ranh Bay is typically hot. Average daily high temperature in September is about 30 degrees above zero. On average, Cam Ranh Bay has 19 rainy, 6 cloudy, 3 sunny, and 2 partly cloudy days in September. The rains are usually heavy. September as well as July, October, November, and December is considered the most uncomfortable time to visit Cam Ranh Bay.