September in Phuket is the windiest, the cloudiest, and the coldest month of the year. In September, the weather in Phuket is typically hot. Average daily high temperature in September is about 28 degrees above zero. On average, Phuket has 29 rainy and 1 cloudy day in September. The rains are usually heavy. September as well as January, March, April, and May is considered the most uncomfortable time to visit Phuket.