July in Nanaimo is the sunniest and the warmest month of the year. In July, the weather in Nanaimo is typically warm. Average daily high temperature in July is about 21 degrees above zero. On average, Nanaimo has 21 sunny, 7 partly cloudy, and 3 rainy days in July. The rains are usually light. July as well as August is considered the most comfortable time to visit Nanaimo.