July in Bacchus Marsh is the rainiest, the cloudiest, and the coldest month of the year. In July, the weather in Bacchus Marsh is typically warm. Average daily high temperature in July is about 11 degrees above zero. On average, Bacchus Marsh has 13 rainy, 10 cloudy, 4 sunny, and 4 partly cloudy days in July. The rains are usually light. July as well as August is considered the most uncomfortable time to visit Bacchus Marsh.