Weymouth avoided relegation from the Zamaretto Premier Division despite losing 3-2 at Truro City on Monday.
Terras finished one place and two points above the drop zone and survived the drop at the expense of Didcot Town, who lost 3-0 to Oxford City.
Terras boss Martyn Rogers told BBC Radio Solent: "It's obviously a great feeling to see the club still in the Southern Premier.
"It was my remit when I joined and I'm pleased to finally achieve that."
It has been an eventful year for the Terras. The club started the season on minus 10 points having gone into administration in March 2010 and then in January saw manager Ian Hutchinson sacked, while chairman George Rolls left the club in February.
But Rogers believes the club can start a clean slate next season and progress up the non-league pyramid.
"Obviously we need to take stock and I think this club can now draw a line," he said.
"Hopefully now is the time to turn things around and get Weymouth at the right end of the table and progress up the pyramid.
"I'm really excited to have a right go from the start of the season and start winning some matches and get a big crowd at Bob Lucas Stadium," he added.
"It would be great to start seeing more fans coming through the turnstiles and the club starting to get into a winning habit because it's certainly overdue."