Do narwhals visit the Isles of Scilly?

No, the narwhal [Monodon monoceros] tends not to venture too far south of 65 degrees North latitude. The narwhal is picky about living conditions. The aquatic mammal prefers Arctic and North Atlantic waters because of the cooler temperatures, the icy refuges from predators, and the specialized prey.

In terms of the United Kingdom, a narwhal may visit the islands off the far northern coast of Scotland. But it's much less likely that a narwhal will visit the Isles of Scilly, which are located off the southwestern coast of England. The Isles are in too southerly a location, at 49 degrees 56 minutes 10 seconds North latitude and 6 degrees 9 minutes 22 seconds West longitude.