August in Bunbury is the coldest month of the year. In August, the weather in Bunbury is typically warm. Average daily high temperature in August is about 16 degrees above zero. On average, Bunbury has 14 rainy, 9 partly cloudy, 7 sunny, and 1 cloudy day in August. The rains are usually heavy. August as well as June, July, and September is considered the most uncomfortable time to visit Bunbury.