In reply to RKernan: Previously been to Buis-les-Baronnies climbing at St Julien (dehydration on the first day almost led to an abseil accident, drink water not wine!), Baume Rousse and Ubriex (all very close), so single and multi pitch. This was before the rockfax guide, very quiet with good climbing. Nice and warm - 28C at the end September.
Also been to Verdon at the same time if you want something longer, again same temperatures.
This year, like the above post suggests, off to Ariege.
Friends have also been to the Dentelles around this time and had stable warm weather - can chose N or S facing walls, depending on weather you want warmth or shade
have fun