In May, the weather in Sao Leopoldo is typically warm. Average daily high temperature in May is about 21 degrees above zero. On average, Sao Leopoldo has 13 partly cloudy, 11 sunny, 5 rainy, and 2 cloudy days in May. The rains are usually heavy. May as well as April and November is considered the most comfortable time to visit Sao Leopoldo.