September in Palm Beach is the cloudiest month of the year. In September, the weather in Palm Beach is typically hot. Average daily high temperature in September is about 30 degrees above zero. On average, Palm Beach has 25 rainy, 3 partly cloudy, 1 sunny, and 1 cloudy day in September. The rains are usually heavy. September as well as June, July, and August is considered the most uncomfortable time to visit Palm Beach.