we have visited ibiza 2003 2004 2004 and2006 x2.and you need to have no concerns about the weather,its always almost to hot for me.as you can see we have been at the end of may for the last 3 years for 2 weeks,and we had 1 slightly dull day last year and 1 the year before,but this sometimes comes as a relief. we have booked for a 4 day break 4 adults no kids on the first of june and i cant wait,i know that it will be hot every day,even if cloudy its hot.go enjoy dont worry you will have a fantastic time. best wishes mo ps.swimming in the sea is fine

ps always go es cana or santa eulalia not sure about the wind in san an,but everyone from san an looks brown on the plane commin home so its not goin to be a problem

we too are going to Ibiza at the end of May, 27th I think!
We've been at the begining of May twice and even then it's been very hot. Only 2 days of rain out of a fortnight!
We swam in the sea no problem!
I don't know about the wind but the sea is usually quite calm in Playa D'en Bossa so I'm guessing theres not much wind!
The thing with Ibiza is even if it only reaches 20 degrees in the day it usually doesn't drop bellow 16 for the night so it's always great for a walk or drinking outside!

We stayed in San Antonio bay at the end of May. We got a few windy days, but the day we visited Playa d'en Bossa it was windier. Suppose your gonna get windy days wherever you go, regardless it not a cold wind and you thankful of it, a bit respite from the blazing sun.
Also not a problem with the sea, it's lovely.
Enjoy.