July in Wigan is the warmest month of the year. In July, the weather in Wigan is typically warm. Average daily high temperature in July is about 18 degrees above zero. On average, Wigan has 22 rainy, 6 sunny, 2 partly cloudy, and 1 cloudy day in July. The rains are usually moderate. July as well as January, February, August, and October is considered the most uncomfortable time to visit Wigan.