August in Aniak is the rainiest month of the year. In August, the weather in Aniak is typically warm. Average daily high temperature in August is about 16 degrees above zero. On average, Aniak has 17 rainy, 7 cloudy, 4 partly cloudy, and 3 sunny days in August. The rains are usually heavy. August as well as January, April, May, and September is considered the most uncomfortable time to visit Aniak.