In September, the weather in Nha Trang is typically hot. Average daily high temperature in September is about 30 degrees above zero. On average, Nha Trang has 17 rainy, 7 cloudy, 3 sunny, and 3 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 Nha Trang.