April in Passo Fundo is the sunniest month of the year. In April, the weather in Passo Fundo is typically warm. Average daily high temperature in April is about 22 degrees above zero. On average, Passo Fundo has 16 sunny, 9 rainy, and 5 partly cloudy days in April. The rains are usually heavy. April as well as May and August is considered the most comfortable time to visit Passo Fundo.