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