January in Jundiai is the rainiest month of the year. In January, the weather in Jundiai is typically hot. Average daily high temperature in January is about 28 degrees above zero. On average, Jundiai has 23 rainy, 4 cloudy, 2 sunny, and 2 partly cloudy days in January. The rains are usually heavy. January as well as February, March, November, and December is considered the most uncomfortable time to visit Jundiai.