August in Cunnamulla is the sunniest month of the year. In August, the weather in Cunnamulla is typically warm. Average daily high temperature in August is about 21 degrees above zero. On average, Cunnamulla has 26 sunny, 3 partly cloudy, and 2 rainy days in August. The rains are usually light. August as well as May and September is considered the most comfortable time to visit Cunnamulla.