July in La Plata is the rainiest and the coldest month of the year. In July, the weather in La Plata is typically warm. Average daily high temperature in July is about 13 degrees above zero. On average, La Plata has 13 sunny, 13 partly cloudy, and 5 rainy days in July. The rains are usually heavy. July as well as June is considered the most uncomfortable time to visit La Plata.