Netflix is off to a decent start in August, bringing Baskin, The Tribe, and Sweet Home to their streaming service. I'm personally curious about Singular Cay, and Sleepy Hollow is always a fun movie to re-visit.
As for the rest of August, Netflix hasn't announced many titles of note (as usual), but the few that we do know are coming are worthwhile.
No Country for Old Men
The Curse of Sleeping Beauty