July in Osoyoos is the sunniest and the warmest month of the year. In July, the weather in Osoyoos is typically warm. Average daily high temperature in July is about 24 degrees above zero. On average, Osoyoos has 29 sunny, 1 rainy, and 1 partly cloudy day in July. The rains are usually light. July as well as August is considered the most comfortable time to visit Osoyoos.