July in Mar del Plata is the coldest month of the year. In July, the weather in Mar del Plata is typically warm. Average daily high temperature in July is about 12 degrees above zero. On average, Mar del Plata has 10 sunny, 8 cloudy, 7 partly cloudy, and 6 rainy days in July. The rains are usually moderate. July as well as June, August, September, and October is considered the most uncomfortable time to visit Mar del Plata.