When we stayed all of Semtember 2008, it was hot-hot-hot for the first two weeks, the third week was peppered with (glorious) thunderstorms, but after that the weather was perfect. Just a tad cooler, but sunny and dry. Ideal for beach. There is always a risk at that time, so you will have to decide whether to take it. But like Tony, Jen and me would prefer being there then to being here in the UK.....
Phil