In reply to Removed UserBicep pou:
Right. My specialist subject.
If you are just south of Barcelona and don't mind driving a little bit, then you must go to the Serra de Prades (Pete O'Donovan's 'Tarragona Climbs' guidebook). Forget going further west to the Lleida region as it'll be a 3 hr drive and it's only really world class in the 7s and 8s (and 9s).
In the 5s and 6s, the classic recommendation is La Mussara. It's all a bit polished now, but the routes are great and the location/views are faultless, although it might be hot.
Siurana is world famous, of course, and although it is better in the higher grades, there is plenty to go at in the 5s and 6s, so you should definitely go there, if only to say that you have.
Avoid Margalef, it is world class above 7 something but below it is rubbish.
One of my favourite crags in the region is Vilanova de Prades: only 20ish metres high, but good rock, hundreds of routes, and a wide spread of grades and easy access. Most relevantly for you, it features the best campsite in the area. I still remember going there in around 2005 and being shocked that they sold us bottles of San Miguel in the bar for 1.20€ (I'm sure things have changed by now). Otherwise, for camping, the site at Siurana is famous and has a real 'climbers vibe', which is very nice.
All this said, the most relevant question you'll face is 'how hot is it?'. Currently the temperature is in the low 20s and it is (just about) possible to climb in the sun, as long as there is shade at the bottom of the crag. But please be very careful, the sun out here is much stronger than in the UK. My suggestion would be to climb in the mornings, take a break, and then hunt the shady sectors in the evening.
Have fun