May in San Juan de los Morros is the rainiest month of the year. In May, the weather in San Juan de los Morros is typically warm. Average daily high temperature in May is about 27 degrees above zero. On average, San Juan de los Morros has 28 rainy, 2 sunny, and 1 cloudy day in May. The rains are usually heavy. May as well as April, June, July, and August is considered the most uncomfortable time to visit San Juan de los Morros.