August in Hervey Bay is the sunniest month of the year. In August, the weather in Hervey Bay is typically warm. Average daily high temperature in August is about 20 degrees above zero. On average, Hervey Bay has 27 sunny, 2 rainy, and 2 partly cloudy days in August. The rains are usually light. August as well as September and October is considered the most comfortable time to visit Hervey Bay.