December in Paysandu is the sunniest month of the year. In December, the weather in Paysandu is typically hot. Average daily high temperature in December is about 29 degrees above zero. On average, Paysandu has 17 sunny, 8 rainy, 4 partly cloudy, and 2 cloudy days in December. The rains are usually heavy. December as well as January and February is considered the most uncomfortable time to visit Paysandu.