In reply to Ed Booth:
We went last year 15t Sept to the end of October. It was a great time to go to see the autumn colours.
When we arrived it was quite warm but you just found the shady crags and climbed on them and temps were fine. If you got in the sun it really was too hot at the start of the trip but cooled down by October.
Was really pleased we had not gone later in the year and would not go myself in November.
Recommend looking at Lago Lindas camping it has a good chill out room if you go later in the year which is good for the dark nights.
http://lagolinda.com/
Went to a different crag nearly every day and did not find them too busy apart from one or two.
Have a good trip wherever you get to!!