May in Memmingen is the rainiest month of the year. In May, the weather in Memmingen is typically warm. Average daily high temperature in May is about 16 degrees above zero. On average, Memmingen has 23 rainy, 7 sunny, and 1 partly cloudy day in May. The rains are usually heavy. May as well as January, February, March, and April is considered the most uncomfortable time to visit Memmingen.