Dexter is currently in its 7th season, which just premiered on September 30, 2012 to 3 million viewers, up 10% from last year. The season is expected to run for 12 episodes.
Showtime has currently renewed the show through season 8. The network has also stated that they wouldn’t completely rule out a 9th season yet, as they want to adequately wrap up the series and they were still developing the trajectory of the storyline.
You can catch new episodes of Dexter on Sundays at 9pm, right before the Emmy Award winning drama Homeland at 10pm.