March in Cabo de Santo Agostinho is the sunniest and the hottest month of the year. In March, the weather in Cabo de Santo Agostinho is typically hot. Average daily high temperature in March is about 28 degrees above zero. On average, Cabo de Santo Agostinho has 17 rainy, 13 sunny, and 1 partly cloudy day in March. The rains are usually heavy. March as well as January, February, April, and May is considered the most uncomfortable time to visit Cabo de Santo Agostinho.