January in Santo Andre is the rainiest and the cloudiest month of the year. In January, the weather in Santo Andre is typically warm. Average daily high temperature in January is about 27 degrees above zero. On average, Santo Andre has 25 rainy, 4 partly cloudy, 1 sunny, and 1 cloudy day in January. The rains are usually heavy. January as well as February, March, November, and December is considered the most uncomfortable time to visit Santo Andre.