August in Cessnock is the sunniest month of the year. In August, the weather in Cessnock is typically warm. Average daily high temperature in August is about 19 degrees above zero. On average, Cessnock has 19 sunny, 7 partly cloudy, and 5 rainy days in August. The rains are usually light. August as well as May and September is considered the most comfortable time to visit Cessnock.