January in Montevideo is the sunniest and the warmest month of the year. In January, the weather in Montevideo is typically warm. Average daily high temperature in January is about 27 degrees above zero. On average, Montevideo has 26 sunny, 3 partly cloudy, and 2 rainy days in January. The rains are usually light. January as well as March, April, November, and December is considered the most comfortable time to visit Montevideo.