July in Wanaka is the coldest month of the year. In July, the weather in Wanaka is typically cold. Average daily high temperature in July is about 4 degrees above zero. On average, Wanaka has 10 cloudy, 8 sunny, 7 partly cloudy, and 6 rainy days in July. The rains are usually moderate. July as well as May, June, August, and September is considered the most uncomfortable time to visit Wanaka.