September in Picton is the rainiest month of the year. In September, the weather in Picton is typically warm. Average daily high temperature in September is about 12 degrees above zero. On average, Picton has 11 sunny, 10 rainy, 8 partly cloudy, and 1 cloudy day in September. The rains are usually moderate. September as well as June, July, and August is considered the most uncomfortable time to visit Picton.