July in Montevideo is the rainiest and the coldest month of the year. In July, the weather in Montevideo is typically warm. Average daily high temperature in July is about 13 degrees above zero. On average, Montevideo has 13 sunny, 11 partly cloudy, 6 rainy, and 1 cloudy day in July. The rains are usually heavy. July as well as August is considered the most uncomfortable time to visit Montevideo.