August in Umiujaq is the warmest month of the year. In August, the weather in Umiujaq is typically warm. Average daily high temperature in August is about 13 degrees above zero. On average, Umiujaq has 20 rainy, 8 cloudy, and 3 sunny 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 Umiujaq.