September in Launceston is the windiest month of the year. In September, the weather in Launceston is typically warm. Average daily high temperature in September is about 13 degrees above zero. On average, Launceston has 13 rainy, 10 partly cloudy, and 7 sunny days in September. The rains are usually heavy. September as well as June, July, August, and October is considered the most uncomfortable time to visit Launceston.