July in Grand Forks is the sunniest and the warmest month of the year. In July, the weather in Grand Forks is typically warm. Average daily high temperature in July is about 26 degrees above zero. On average, Grand Forks has 21 sunny, 6 partly cloudy, and 4 rainy days in July. The rains are usually heavy. July as well as August is considered the most comfortable time to visit Grand Forks.