May in Chacaltaya is the sunniest month of the year. In May, the weather in Chacaltaya is typically warm. Average daily high temperature in May is about 12 degrees above zero. On average, Chacaltaya has 21 rainy, 8 sunny, and 2 partly cloudy days in May. The rains are usually heavy. May as well as January, February, March, and April is considered the most uncomfortable time to visit Chacaltaya.