January in Grodzisk Wielkopolski is the snowiest and the coldest month of the year. In January, the weather in Grodzisk Wielkopolski is typically cold. Average daily high temperature in January is about 1 degree above zero. On average, Grodzisk Wielkopolski has 13 cloudy, 7 rainy, 6 partly cloudy, 3 sunny, and 2 snowy days in January. The rains are usually moderate. January as well as February, March, October, and November is considered the most uncomfortable time to visit Grodzisk Wielkopolski.