July in Wanganui is the coldest month of the year. In July, the weather in Wanganui is typically warm. Average daily high temperature in July is about 11 degrees above zero. On average, Wanganui has 14 rainy, 8 sunny, 8 partly cloudy, and 1 cloudy day in July. The rains are usually moderate. July as well as May, June, August, and September is considered the most uncomfortable time to visit Wanganui.