July in Rotorua is the coldest month of the year. In July, the weather in Rotorua is typically cold. Average daily high temperature in July is about 9 degrees above zero. On average, Rotorua has 15 rainy, 9 sunny, 6 partly cloudy, and 1 cloudy day in July. The rains are usually heavy. July as well as June, August, September, and October is considered the most uncomfortable time to visit Rotorua.