Discuss the setting.

The setting of August: Osage County is a rural area outside Pawhuska, Oklahoma, a small town of about 4,000 people near Tulsa.  The play primarily takes place in the country home of Beverly Weston, a noted poet, and his wife Violet, a pill-addicted cancer patient.  They are the parents of three adult daughters who arrive back at the family home when Beverly goes missing.  He is later found to have drowned.  The play is set in the present day, during some extraordinarily hot late summer days.  
The plains of Oklahoma are stark and life can be difficult there; this is meant to underscore the setting of the difficult life of the Weston family, driven by Violet's terminal discontent and frequent rages.  The house itself is run down and contributes to the mood of discontent and resentment that plagues Violet and her daughters, which in the absence of Beverly, come to the fore.