April in Oswiecim is the sunniest month of the year. In April, the weather in Oswiecim is typically warm. Average daily high temperature in April is about 14 degrees above zero. On average, Oswiecim has 11 rainy, 9 sunny, 5 cloudy, and 5 partly cloudy days in April. The rains are usually moderate. April as well as January, February, March, and May is considered the most uncomfortable time to visit Oswiecim.