In January, the weather in Cabo de Santo Agostinho is typically hot. Average daily high temperature in January is about 29 degrees above zero. On average, Cabo de Santo Agostinho has 23 rainy, 4 sunny, and 4 partly cloudy days in January. The rains are usually moderate. January as well as February, March, April, and May is considered the most uncomfortable time to visit Cabo de Santo Agostinho.