September in San Pedro is the rainiest month of the year. In September, the weather in San Pedro is typically hot. Average daily high temperature in September is about 28 degrees above zero. On average, San Pedro 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, August, and October is considered the most uncomfortable time to visit San Pedro.