August in Bangor is the rainiest month of the year. In August, the weather in Bangor is typically warm. Average daily high temperature in August is about 16 degrees above zero. On average, Bangor has 23 rainy, 4 cloudy, 3 sunny, and 1 partly 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 Bangor.