May in Tlaxcala de Xicoténcatl is the warmest month of the year. In May, the weather in Tlaxcala de Xicoténcatl is typically warm. Average daily high temperature in May is about 20 degrees above zero. On average, Tlaxcala de Xicoténcatl has 18 rainy, 8 partly cloudy, 4 sunny, and 1 cloudy day in May. The rains are usually heavy.