August in Launceston is the rainiest month of the year. In August, the weather in Launceston is typically warm. Average daily high temperature in August is about 11 degrees above zero. On average, Launceston has 13 partly cloudy, 10 sunny, and 8 rainy days in August. The rains are usually moderate. August as well as July and September is considered the most uncomfortable time to visit Launceston.