May in Bohumín is the rainiest month of the year. In May, the weather in Bohumín is typically warm. Average daily high temperature in May is about 19 degrees above zero. On average, Bohumín has 14 rainy, 9 partly cloudy, 6 sunny, and 2 cloudy days in May. The rains are usually heavy. May as well as January, February, March, and April is considered the most uncomfortable time to visit Bohumín.