The 21-year-old formed an impressive partnership with Christian Benteke in a difficult first season under Paul Lambert which almost saw the Villa Park side relegated, but has committed his future until 2016.
Last season was something of a breakout campaign for Weimann, who scored 12 goals in 38 games in all competitions, following two stop-start campaigns since emerging from the club's academy.
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"It was exciting to be part of the team's development because the potential within this young, exciting team is really strong.
"The last several months of the season we played really well and got better and better as season went on. Hopefully, we can continue on like we finished and that will be the challenge. Like the other young players in the team, I want to keep improving as a player and keep pushing Villa as high as we can in the Premier League.
"I feel like I owe the manager and the club because the manager backed me last season after he came in and I have always felt comfortable and really supported at the club.”
“Andi has shown a great work ethic and that's the big thing about him along with his quality," the Villa manager added.
"He has drive and a hunger to succeed and that's vital. That's what we're looking for here at Villa.
"He got a sustained run at it last season and he showed the quality that marks him out as a natural finisher. He definitely knows where the goal is and his performances on that right side, coming off the lines, have been really great.”