May in Uniontown is the rainiest month of the year. In May, the weather in Uniontown is typically warm. Average daily high temperature in May is about 20 degrees above zero. On average, Uniontown has 22 rainy, 7 sunny, 1 cloudy, and 1 partly cloudy day in May. The rains are usually moderate. May as well as January, February, March, and December is considered the most uncomfortable time to visit Uniontown.