August in Caloundra is the sunniest month of the year. In August, the weather in Caloundra is typically warm. Average daily high temperature in August is about 20 degrees above zero. On average, Caloundra has 27 sunny, 3 rainy, and 1 partly cloudy day in August. The rains are usually moderate. August as well as September and November is considered the most comfortable time to visit Caloundra.