March in Hervey Bay is the rainiest month of the year. In March, the weather in Hervey Bay is typically warm. Average daily high temperature in March is about 26 degrees above zero. On average, Hervey Bay has 15 rainy, 13 sunny, and 3 partly cloudy days in March. The rains are usually heavy. March as well as January and February is considered the most uncomfortable time to visit Hervey Bay.