Galapagos Warm Season:Water temperature varies from 70°F (21°C) to 80°F (27°C)
The time period between December and May is considered the "warm season." During this warmer season, the Galapagos' climate is more tropical with daily rain and cloudier skies. Also, the ocean temperature is warmer for swimming and snorkeling.
During this season the tourists may observe a large number of species around the islands such as marine iguanas, sea turtle, land iguanas, flamingos, white-cheeked pintails, masked boobies, marine iguanas, albatross, and blue-footed boobies. Since the water's warmer, snorkeling is highly recommended during these months
Galapagos Dry SeasonWater temperature varies 65°F (18°C) to 75°F (23°C)
From June to December the southern trade winds bring the colder Humboldt Current north to the Galapagos. This means that the water is cooler, and a layer of high atmosphere mist pervades the island skies.
In effect, the highlands of the larger islands are kept green and lush while the sea level islands and shorelines have little precipitation. Thus, June to December is generally called the "dry season" which is known for its blue skies and mid-day showers.
During this season the tourists may observe a large number of species around the islands and in the sea such as giant tortoises, humpback whales, blue-footed boobies, cormorants, oystercatchers, lava lizards, Galapagos hawks, masked boobies, swallow-tailed gulls, sea lions, lava herons, brown noddies, and penguins. Due to the water temperature, it is the perfect time for diving.