July in Warrnambool is the coldest month of the year. In July, the weather in Warrnambool is typically warm. Average daily high temperature in July is about 12 degrees above zero. On average, Warrnambool has 22 rainy, 5 cloudy, and 4 sunny days in July. The rains are usually heavy. July as well as May, June, August, and September is considered the most uncomfortable time to visit Warrnambool.