July in Kelowna is the sunniest month of the year. In July, the weather in Kelowna is typically warm. Average daily high temperature in July is about 24 degrees above zero. On average, Kelowna has 19 sunny, 7 partly cloudy, and 5 rainy days in July. The rains are usually light. July as well as August is considered the most comfortable time to visit Kelowna.