In May, the weather in Eastmain is typically cold. Average daily high temperature in May is about 4 degrees above zero. On average, Eastmain has 10 partly cloudy, 8 cloudy, 7 sunny, 5 rainy, and 1 snowy day in May. The rains are usually moderate. May as well as January, February, March, and July is considered the most uncomfortable time to visit Eastmain.