In August, the weather in Cabo de Santo Agostinho is typically warm. Average daily high temperature in August is about 25 degrees above zero. On average, Cabo de Santo Agostinho has 16 rainy, 11 sunny, and 4 partly cloudy days in August. The rains are usually moderate. August as well as January, February, March, and April is considered the most uncomfortable time to visit Cabo de Santo Agostinho.