May in Saltillo is the warmest month of the year. In May, the weather in Saltillo is typically warm. Average daily high temperature in May is about 25 degrees above zero. On average, Saltillo has 19 sunny, 10 partly cloudy, and 2 rainy days in May. The rains are usually moderate. May as well as March, April, and October is considered the most comfortable time to visit Saltillo.