July in Santiago is the rainiest month of the year. In July, the weather in Santiago is typically hot. Average daily high temperature in July is about 33 degrees above zero. On average, Santiago has 25 rainy, 3 partly cloudy, 2 cloudy, and 1 sunny day in July. The rains are usually heavy. July as well as May, June, August, and September is considered the most uncomfortable time to visit Santiago.