In reply to NicolaO:
You want warm, but some of the best Spanish areas may be scorchingly hot still in September, but Mallorca offers the option of DWS if the bolted crags are too hot (Rockfax guide covers Sport and DWS). Costa Blanca area is another option, again you'll need to research shady options to maximise your climbing opportunities (Rockfax guide).
Ariege (French side of the Pyrenees) is slightly higher, likely to be a little cooler and has plenty in the right grade range
Calamès (Limestone) and
Auzat (Granite) are especially good low/mid grade Sports Climbing venues, again Rockfax do a guidebook. Some of the other major destinations in the South of France are better for those operating in higher grades, but there are exceptions.
All easy to access fly to Palma (Mallorca), Alicante (Costa Blanca), Carcassonne or Toulouse for Ariege. Hiring a car is an advantage in all these places.