May in Borovets is the rainiest month of the year. In May, the weather in Borovets is typically warm. Average daily high temperature in May is about 13 degrees above zero. On average, Borovets has 25 rainy, 5 sunny, and 1 partly cloudy day in May. The rains are usually heavy. May as well as February, March, April, and December is considered the most uncomfortable time to visit Borovets.