As demonstrated by The Conjuring: Last Rites, horror movies are back in season at the box office. But there are still plenty of horror films you can stream at home. The Watch With Us team has looked over the newly arrived films from Netflix, Hulu, HBO Max and more to put together our picks for the three must-watch horror movies you need to stream in September. This year's horror breakout, Weapons, is still a few months away from streaming.