K.A.
Read your original lease. Even though the term of the lease has expired, it should have language in it that addresses the automatic renewal and notice of termination. We have a rental house and use a standard lease agreement. It states that the lease automatically renews on a month-to-month basis until written notice of termination is given by either party, and that the termination is effective 30 days after notice is given. You may have to give 30 days notice, but it seems like 30 days from now would be August 6th, not August 31st. Just read over your lease and be sure to give the notice in writing. Good luck!