August in Chignik Lagoon is the warmest month of the year. In August, the weather in Chignik Lagoon is typically warm. Average daily high temperature in August is about 12 degrees above zero. On average, Chignik Lagoon has 22 rainy, 7 cloudy, and 2 sunny days in August. The rains are usually heavy. August as well as April, May, June, and July is considered the most uncomfortable time to visit Chignik Lagoon.