July in Wilmington is the cloudiest and the hottest month of the year. In July, the weather in Wilmington is typically hot. Average daily high temperature in July is about 30 degrees above zero. On average, Wilmington has 11 rainy, 10 sunny, and 10 partly cloudy days in July. The rains are usually moderate. July as well as January, February, June, and August is considered the most uncomfortable time to visit Wilmington.