January in Adak Island is the snowiest and the coldest month of the year. In January, the weather in Adak Island is typically cold. Average daily high temperature in January is about 1 degree above zero. On average, Adak Island has 11 partly cloudy, 9 cloudy, 7 rainy, 2 snowy, and 2 sunny days in January. The rains are usually heavy. January as well as February, March, April, and May is considered the most uncomfortable time to visit Adak Island.