Lining up for the fifth consecutive time in the league this term away at Sparta Rotterdam, Weghorst produced a match-winning performance to help his side pick up their fourth win of the campaign.
The former Holland Under-21 international scored both goals in the 2-0 win - his fifth and sixth strikes of the season - and it could have been even better had he not missed two penalties.
His early displays are starting to catch the eye of potential suitors but the 25-year-old says his only focus is on keeping his form going and reaching his goal target.
"I am happy to have scored two goals but also a little bit disappointed to have missed two penalties," Weghorst told NOS. "I am a perfectionist who demands a lot of himself and I had a mentality tonight that I am not leaving the pitch without scoring.
"I have set myself a target to score 20 goals this season and I believe that is a feasible target for an AZ Alkmaar striker and I am going to do all I can to achieve it."