May in Quebec is the rainiest month of the year. In May, the weather in Quebec is typically warm. Average daily high temperature in May is about 14 degrees above zero. On average, Quebec has 18 rainy, 6 sunny, 6 partly cloudy, and 1 cloudy day in May. The rains are usually moderate. May as well as January, April, October, and November is considered the most uncomfortable time to visit Quebec.