May in Miramichi is the rainiest month of the year. In May, the weather in Miramichi is typically warm. Average daily high temperature in May is about 13 degrees above zero. On average, Miramichi has 20 rainy, 4 sunny, 4 cloudy, and 3 partly cloudy days in May. The rains are usually moderate. May as well as April and November is considered the most uncomfortable time to visit Miramichi.