August in Dutch Harbor is the warmest month of the year. In August, the weather in Dutch Harbor is typically warm. Average daily high temperature in August is about 11 degrees above zero. On average, Dutch Harbor has 17 rainy, 12 cloudy, 1 sunny, and 1 partly cloudy day in August. The rains are usually heavy. August as well as April, May, June, and July is considered the most uncomfortable time to visit Dutch Harbor.