In May, the weather in Chacaltaya is typically cold. Average daily high temperature in May is about 9 degrees above zero. On average, Chacaltaya has 15 rainy, 6 cloudy, 6 partly cloudy, and 4 sunny days in May. The rains are usually light. May as well as January, February, March, and April is considered the most uncomfortable time to visit Chacaltaya.