Aguero became City's all-time record league goalscorer, his treble taking him to 160 goals.
It also saw the Argentine – who is the Club's al-time leading goalscorer - draw level with Alan Shearer with 11 Premier League hat-tricks.
"I have to continue the same way, but it's important to win," said Aguero.
Aguero could have had four as he missed a close-range effort in the first half.
He added: “I don't know, sometimes it happens. The next one I scored. The important thing is to get the ball and for the team to win."