It won't be swimming temps at around 18c to 19c just slightly warmer than out sea temps in the summer.

just got back 5 hours ago been in the see ,takes your breath away stayed in for a little while, then had to decline , must say would not ike to go in november as the evenings did get a little chilly , im a sun goddess , so its up to you what your version of warm is , also very quiet and lots of people are talkind about shutting up next week , there were a lot closing while we were here , and magaluf is not at all loud, sorry if thats what you did not want to hear , but still had a great holiday xx