December in Cabo de Santo Agostinho is the cloudiest month of the year. In December, the weather in Cabo de Santo Agostinho is typically warm. Average daily high temperature in December is about 27 degrees above zero. On average, Cabo de Santo Agostinho has 16 rainy, 8 sunny, and 7 partly cloudy days in December. The rains are usually moderate. December as well as January, February, March, and April is considered the most uncomfortable time to visit Cabo de Santo Agostinho.