Santiago's climate is temperate, with some continental features. In summer -December through March- temperatures can reach 30ºCelsius, while in winter -June through August- there are heavy but short rains. The annual average temperature is 14ºC.
It only snows in the mountain range area, specifically at the winter resorts, snowfalls often starting in the second fortnight of June, and lasting until the first fortnight of October.
To see what kind of weather you are likely to have, you may consult this page and click here before traveling.