During the December-May period the water temperature on Wolf and Darwin islands rises to 78-80°F (25-27°C) and there are no seasonal winds, which can negatively affect the underwater visibility. So this is your perfect time to experience the ethereal underwater world of the Galapagos Islands.
So what can you expect from this fascinating journey? This is one of the most perfect places to explore hammerheads and mantas, especially from December through May. The sharks tend to “wall up”, creating a solid school of large sharks in very close proximity to each other.
Best place to look for these “shark walls” is around the reefs. Typically, you'll see the wall of hammerheads facing the current and slowly undulating their tails just enough to maintain their position—it totally seems that they're flying. Incredible!