July in Busselton is the rainiest, the cloudiest, and the coldest month of the year. In July, the weather in Busselton is typically warm. Average daily high temperature in July is about 16 degrees above zero. On average, Busselton has 17 rainy, 7 sunny, 5 partly cloudy, and 2 cloudy days in July. The rains are usually heavy. July as well as June and August is considered the most uncomfortable time to visit Busselton.