May in Machu Picchu is the sunniest month of the year. In May, the weather in Machu Picchu is typically warm. Average daily high temperature in May is about 16 degrees above zero. On average, Machu Picchu has 27 rainy, 3 partly cloudy, and 1 sunny 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 Machu Picchu.