January in Adak Island is the coldest month of the year. In January, the weather in Adak Island is typically cold. Average daily high temperature in January is about 2 degrees above zero. On average, Adak Island has 26 rainy, 3 cloudy, and 2 sunny days in January. The rains are usually moderate. January as well as February, March, April, and May is considered the most uncomfortable time to visit Adak Island.