I've been a resident of PS for about 5 years now and I love it. One of my favorite things to do is sit by the pool at night, usually after 10 pm. It is still warm but there is typically a breeze. You won't need a sweater. I moved from NYC and all of my sweaters, jackets and coats are gathering dust.
If this is your primary vacation for this year or you like to travel/stay in style, I strongly recommend staying at The Hacienda Inn. This mens only, clothing optional property is absolutely beautiful. The rooms are beautifully appointed, many with kitchenettes. The grounds are lovely with two pools and spas. Full continental breakfast is served every morning. I believe you said you were staying 5 or more days. The Hacienda Inn has two deals based on length of stay, either one or two free nights. That would be a substantial savings. www.thehacienda.com.
If you have more detailed questions, please send me a dm. I can give you my telephone number and we can chat.