August in Bairnsdale is the rainiest month of the year. In August, the weather in Bairnsdale is typically warm. Average daily high temperature in August is about 14 degrees above zero. On average, Bairnsdale has 11 sunny, 10 partly cloudy, 8 rainy, and 2 cloudy days in August. The rains are usually moderate. August as well as June and July is considered the most uncomfortable time to visit Bairnsdale.