September in Santa Barbara is the windiest month of the year. In September, the weather in Santa Barbara is typically hot. Average daily high temperature in September is about 32 degrees above zero. On average, Santa Barbara has 28 rainy, 1 cloudy, and 1 partly 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 Santa Barbara.