What is Cap d`agde like from Sept 20-24?

Hi, Does anyone have any idea if Cap d'agde is worth going to from Sept 20-24? Would there be some people there? I know it will be end of the season...Would the weather be warm enough actually to go nude during the day? Thanks. I am going from Sept 20-25...and from 16-20 to Marseille....I do not know if there is achance for nudism in Marseille..Any ideas?