In April, the weather in Iwonicz-Zdroj is typically warm. Average daily high temperature in April is about 12 degrees above zero. On average, Iwonicz-Zdroj has 14 rainy, 9 sunny, 5 partly cloudy, and 2 cloudy days in April. The rains are usually moderate. April as well as February, March, May, and November is considered the most uncomfortable time to visit Iwonicz-Zdroj.