I only joined adsense at the beginning of july and when I asked support about when I would get paid this is the response I got :-
Thank you for your email.
Google will mail you a check within 30 days after the end of each calendar month that Google AdWords ads are running on your site if your earned balance is US $100 or more. If your account balance is less than $100, we'll send you a check at the end of the first month after your balance reaches $100. Additionally, we will pay out all accounts at the end of each year, regardless of account balance.
So, if you qualify in July, a check will be mailed to you before the end of August.