Santiago and middle Chile are best in September through November, or during late February into April. Which popular natural attractions like Parquet National del Paine in Magallanes and the lakes regions are best in December through March. Ski resorts draw many foreigners during June through August.
Easter Island is cooler, slightly cheaper and less crowded outside the summer months.
March is a great time to visit Juan Fernandez archipelago. It may be increasable if winter rains erode the dirt airstrip.