May in Louisville is the rainiest month of the year. In May, the weather in Louisville is typically warm. Average daily high temperature in May is about 23 degrees above zero. On average, Louisville has 18 rainy, 9 sunny, 3 cloudy, and 1 partly cloudy day in May. The rains are usually heavy. May as well as January, February, March, and December is considered the most uncomfortable time to visit Louisville.