That I have yet to find out, as we will be there early august, ad as you will probably know Brittany is as reliable as the UK for forecasting the weather.
------------- When you wake up in the morning to the sounds and sights of the campsite, ask yourself one question.....who's nicked my tent?????
Its a reasonable question. If you are right on coast then on some sites the pitches are sand so best pegs are 18inch long wooden ones. A resonable cheaper substitute is 12inch long plastic pegs. If its stony soil then rock pegs are what you need.
Most campers take a selection. Certainly don't be without rock pegs, but if anybody can put you specifically right that soil is sandy & soft then longer pegs are what you need as well.
We stayed there around 8 years ago. From memory the ground is more soil than sand with the site being inland. However, as others do, we take a selection of pegs. If you have teenagers the site is fantastic with loads to do. The only thing we did not like was the local area which didn't have a lot to offer.