July in Cowes is the rainiest and the coldest month of the year. In July, the weather in Cowes is typically warm. Average daily high temperature in July is about 12 degrees above zero. On average, Cowes has 14 rainy, 11 partly cloudy, 5 sunny, and 1 cloudy day in July. The rains are usually moderate. July as well as May, June, August, and September is considered the most uncomfortable time to visit Cowes.