Depends what you’re comparing it to. South west Scotland is where the gulf stream (aka the North Atlantic Current) hits. The sea there is warmer than much of the rest of the coast in the UK except the south west of England for the same reasons. So, not Carribean or Mediteranean levels of warm but enough to be enjoyable in the mid 70s when we had a series of blissful, long summers.
Depends what you’re comparing it to. South west Scotland is where the gulf stream (aka the North Atlantic Current) hits. The sea there is warmer than much of the rest of the coast in the UK except the south west of England for the same reasons. So, not Carribean or Mediteranean levels of warm but enough to be enjoyable in the mid 70s when we had a series of blissful, long summers.