In August, the weather in Plettenberg Bay is typically warm. Average daily high temperature in August is about 17 degrees above zero. On average, Plettenberg Bay has 16 sunny, 10 rainy, 4 partly cloudy, and 1 cloudy day in August. The rains are usually moderate. August as well as June, July, September, and October is considered the most uncomfortable time to visit Plettenberg Bay.