Nevis is not well known for whale watching, but it is a possibility at two main times during the year. The first is during March and April, when migrating whales pass through the general area heading south, and the second is late October through early December when the whales are heading back north. 

There are over 30 species of cetaceans that are found in the Caribbean, but most are not easy to see.  The whales that can sometimes be seen in this part of the Leeward Islands include Humpback whales, Sperm whales, Pygmy Sperm whales, and Pilot whales, as well as several different kinds of dolphins. 

In general however, it is worth saying that you are quite likely to see turtles and dolphins off of Nevis, but not so likely to see whales.