More empty seats in theaters.

Box office revenue this weekend hit its lowest level since the weekends following the September 11, 2001 terrorist attacks as Hurricane Harvey closed Texas theaters, Mayweather/McGregor snatched Saturday night viewers and a lack of new product closed out an historically slow August, according to the Hollywood Reporter.

Revenue for this weekend fell 45% from the same weekend last year. Summer box office sales have now slumped more than 14% from last year.

No new offerings cleared $5 million in ticket sales, leaving an opening for Lions Gate (LGF.A - Get Report) holdover "The Hitman's Bodyguard" to snag the top spot with $10 million in sales. Animated family flick "Leap!" did the best of the openers, grossing just under $5 million.

Specialty box office openings were also soft, with "Ingrid Goes West" and "Good Time" each opening to $781,750 and $610,890, respectively in limited release.

More of What's Trending on TheStreet: