The 21-year-old spent the first half of the campaign on loan with the Buddies but returned to his parent club last week.
Boss Alan Pardew gave him a debut from the bench in the FA Cup defeat to Brighton but the young defender believes he will improve further with more first-team football in Paisley.
Dummett said: "I loved my time at St Mirren. For a Newcastle lad playing for the club, it's not easy moving away but St Mirren was the right choice.
"I played 19 games and picked up some really good experience of playing at a competitive level. I played in front of some big crowds like 40,000 at Celtic Park. There's no doubt that has helped my development as a player.
"Danny Lennon is a really good manager and I can't fault a single thing about the club. It was his help that allowed me to make my debut for Newcastle. That was a dream come true.
"But I'm hopeful that I will come back to Saints for another six months. I've improved so much with them this season and I want to continue that development before going back to Newcastle a much better player in the summer.
"It's not in my hands but, if both sides can make it work, returning before the League Cup semi-final with Celtic (on 27 January) is the plan."