January in Passo Fundo is the rainiest, the cloudiest, and the warmest month of the year. In January, the weather in Passo Fundo is typically hot. Average daily high temperature in January is about 28 degrees above zero. On average, Passo Fundo has 17 rainy, 7 sunny, 5 partly cloudy, and 2 cloudy days in January. The rains are usually heavy. January as well as February, March, October, and December is considered the most uncomfortable time to visit Passo Fundo.