September in Sidney is the sunniest month of the year. In September, the weather in Sidney is typically warm. Average daily high temperature in September is about 24 degrees above zero. On average, Sidney has 13 sunny, 8 rainy, 7 partly cloudy, and 2 cloudy days in September. The rains are usually heavy. September as well as {{month_nom: February}}, and {{month_nom: February}} is considered the most comfortable time to visit Sidney.