We arrived yesterday, it was hot and sunny (saw lots of sun burnt people and the beach was packed). It only cooled off slightly in the evening.
Today is cloudy and cool, but not cold. No one is round the pool at the moment. We're hoping yesterday's weather returns soon!
Packing advice: definitely layers. Pack beach/pool clothes, but make sure you're prepared for cooler days. I was really pleased I'd got 20kg luggage allowance, or I would have been struggling!