Following his time at Western Suburbs, McCowatt moved to ISPS Handa Premiership club Auckland City along with fellow Olé graduates Dalton Wilkins and Owen Parker-Price on 26 September 2017. Though he was originally intended for the youth team, McCowatt eventually started every game Auckland City played that season, including the FIFA Club World Cup and OFC Champions League campaigns. McCowatt scored the only goal in the grand final as Auckland City defeated Team Wellington 1–0 to lift the league title.