May in Xalapa is the warmest month of the year. In May, the weather in Xalapa is typically warm. Average daily high temperature in May is about 25 degrees above zero. On average, Xalapa has 20 rainy, 6 sunny, and 5 partly cloudy days in May. The rains are usually heavy. May as well as June, July, August, and September is considered the most uncomfortable time to visit Xalapa.