The Chile Summer Program is held during the autumn season for South America.  In May, the average high temperature is 64 degrees Fahrenheit and the average low temperature is 41 degrees Fahrenheit with an average precipitation of 2.3 inches.

In June, the average high temperature is 58 degrees Fahrenheit and the average low temperature is 38 degrees Fahrenheit with an average precipitation of 3.10 inches.  Bring a sweater and your snowboard.
When it is summer in the United States, it is winter in Chile, and vice versa. The average annual temperature in Santiago is about 58°F. During the Chilean summer, the temperature raises to an average 67°F, whereas in the winter, it usually drops to 48°F. Keep in mind that the variety of Chile’s land area (north to south; valley to mountain) provides for wide-ranging weather conditions if you travel around the country.

Note as well that very cold winters have occurred in the past few years, including in Santiago. For example, some days during a recent winter saw a high of only 23°F, and the first snowfall in the capital in almost a decade occurred recently as well. Be prepared for possible lows such as these during the months of May through September.