August in Eastmain is the warmest month of the year. In August, the weather in Eastmain is typically warm. Average daily high temperature in August is about 14 degrees above zero. On average, Eastmain has 14 rainy, 9 partly cloudy, 6 sunny, and 2 cloudy days in August. The rains are usually heavy. August as well as January, February, March, and May is considered the most uncomfortable time to visit Eastmain.