In April, the weather in Sosnowiec is typically warm. Average daily high temperature in April is about 13 degrees above zero. On average, Sosnowiec has 12 rainy, 9 sunny, 7 partly cloudy, and 2 cloudy days in April. The rains are usually moderate. April as well as January, February, March, and November is considered the most uncomfortable time to visit Sosnowiec.