In reply to Diana Smart:
Well, all depends on what you class as too hot. I've climbed in Sicily (San Vito area) in August. It was hot! Low 30s. However, I like the heat and over the years I have climbed every year in August in various Med destinations such as Mallorca, Spain, Kalymnos, Sardinia etc and loved it.
So, personally, I'd recommend it especially as you're not going just to climb. There's always the beach as well and Sicily is a beautiful place.
The climbing at San Vito lo Capo is great and lots of it is VERY close to the coast: almost literally a stone's throw away. You can climb and then be in the water within a minute or two.
We actually stayed a bit further south at a small coastal resort called Cornino. There is a crag above the village called Never Sleeping Wall and from there to beach is probably 10 mins walk.
Hope this helps. Whatever you go for... enjoy!
Christy