It is possible to see wildlife in the Galapagos any time of year because so much is endemic to the islands. Each time of year has its own advantages, whether it is chicks hatching, sea lions mating, birds nesting or plants flowering – these events occur year round and whenever you travel you can enjoy at least one or more of the above natural events. In terms of weather, December to May is generally the hot season, with the chance of the odd heavy shower, whereas June to November is the cooler season when the seas are cooler and the days can be cloudier. Winds can be stronger in July and August leading to bigger swells.
To a greater or lesser extent most of the islands in the Galapagos are home to almost the entire range of fauna and flora, so whatever islands you visit, you will get to see most of the unique wildlife the archipelago have to offer. Swimming and snorkelling is possible at almost every island too, so you can experience the beauty and diversity of the underwater world as well as the land creatures. Santa Cruz Island is the best place to spot giant tortoise.