City are now second in the Premier League, behind Manchester United only on goal difference.
Speaking after the game, Aguero was typically nonchalant after another deadly display of finishing.
Sergio Aguero has six goals and one assist in four previous appearances against the Hornets in all competitions.
City are white hot at the other end, scoring nine goals in their last two games without reply.
But Aguero provided only half of City's scoring total. "He's an important player in our squad but now is the moment to find another solution", Silva told the club website.
The Hornets have looked very hard to beat under Marco Silva this season, and this could be a potential banana-peel for Pep Guardiola's side. The duo have starred up front together in recent weeks and Aguero, for the second game running, set up Jesus for a goal as the South American duo tore Watford's defense apart.
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City won only two Premier League fixtures out of the seven that followed their Champions League group and knockout matches last season. Aguero claimed his third off a brilliant individual effort in which he weaved through the Watford defense and scuffed in a shot past the keeper to give him five goals in his last three matches.
"I was lucky to manage Barcelona with many outstanding performances but this week has been a lot of goals".
"We know how much quality we have", said the 26-year-old Belgium worldwide.
The Hornets have also made a positive start to the campaign, but they have yet to pick up maximum points on home soil and have not prevailed at Vicarage Road since mid-April.
Guardiola, however, was quick to call for calm after a similarly impressive start last season ended trophyless.
The victory took City to the top of the table, but Manchester United can join it on Sunday with a win over Everton.
After battering Liverpool and Feyenoord, City made it 15 goals scored in the space of eight days without conceding a single goal.
"Watford is just two points behind us", he added.