The high season (November through March) occurs during South America's summer, but be prepared for varied climates that can change rapidly wherever you go. The warm mid-70s temps you're enjoying could become the windy, rainy low 40s in the blink of an eye. Plus, when it's steamy in Buenos Aires, it can be quite chilly in ports like Punta Arenas and Ushuaia. Although you can expect crowds of South Americans on vacation, you can find high-season bargains in the weeks between Thanksgiving and Christmas.

High season is pretty much year-round in the Galapagos Islands, where the warm and tropical climate is relatively unchanging. However, those prone to seasickness should avoid August and September, when waters can be choppier.

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