January in Plzeň is the snowiest, the cloudiest, and the coldest month of the year. In January, the weather in Plzeň is typically freezing. Average daily high temperature in January is about zero. On average, Plzeň has 21 cloudy, 4 rainy, 3 snowy, and 3 sunny days in January. The rains are usually light. January as well as February, May, and December is considered the most uncomfortable time to visit Plzeň.