August in Puerto Aisen is the cloudiest month of the year. In August, the weather in Puerto Aisen is typically cold. Average daily high temperature in August is about 2 degrees above zero. On average, Puerto Aisen has 29 rainy, 1 sunny, and 1 cloudy day in August. The rains are usually heavy. August as well as January, February, March, and April is considered the most uncomfortable time to visit Puerto Aisen.