October in Monterrey is the sunniest month of the year. In October, the weather in Monterrey is typically warm. Average daily high temperature in October is about 25 degrees above zero. On average, Monterrey has 27 sunny, 3 partly cloudy, and 1 rainy day in October. The rains are usually light. October as well as February, March, and November is considered the most comfortable time to visit Monterrey.