January in Poznan is the snowiest, the cloudiest, and the coldest month of the year. In January, the weather in Poznan is typically freezing. Average daily high temperature in January is about zero. On average, Poznan has 13 cloudy, 8 rainy, 8 snowy, and 2 sunny days in January. The rains are usually light. January as well as February, March, November, and December is considered the most uncomfortable time to visit Poznan.