May in Kostelec na Hané is the rainiest month of the year. In May, the weather in Kostelec na Hané is typically warm. Average daily high temperature in May is about 17 degrees above zero. On average, Kostelec na Hané has 14 rainy, 8 sunny, 6 partly cloudy, and 3 cloudy days in May. The rains are usually moderate. May as well as January, February, March, and April is considered the most uncomfortable time to visit Kostelec na Hané.