January in Itapecerica da Serra is the rainiest and the cloudiest month of the year. In January, the weather in Itapecerica da Serra is typically warm. Average daily high temperature in January is about 24 degrees above zero. On average, Itapecerica da Serra has 28 rainy and 3 sunny days in January. The rains are usually heavy. January as well as February, March, April, and October is considered the most uncomfortable time to visit Itapecerica da Serra.