July in San José de Mayo is the coldest month of the year. In July, the weather in San José de Mayo is typically warm. Average daily high temperature in July is about 14 degrees above zero. On average, San José de Mayo has 13 sunny, 12 partly cloudy, 5 rainy, and 1 cloudy day in July. The rains are usually heavy. July as well as August and September is considered the most uncomfortable time to visit San José de Mayo.