A Safety Car called for Paul Dumbrell's crash was interrupted on lap 37 only by the suspension of the race for the first time.
Standing water and rivers running across the track surface were the chief concerns, and a second attempt to restart proceedings only lasted another five laps behind the Safety Car.
The race was suspended again as the conditions further deteriorated before it was ultimately cancelled at 4:25pm, 4:48pm AEST having been the time certain finish, declared a non-race with no points awarded.
As a result, McLaughlin will head to the ITM Auckland SuperSprint on November 2-4 with a 14-point championship lead over van Gisbergen, with four races remaining – two 200km races in at Pukekohe and two at Newscastle.
Craig Lowndes and Steven Richards are also the winners of the 2018 Enduro Cup, by 87 points over McLaughlin and Alex Premat.
Lowndes, who retires as a fulltime driver in Supercars at the end of the season, will head to Pukekohe for the final time. The seven-time Bathurst winner has never won at Pukekohe, the track used for more than 10 years for the championship, where he not reached the top of the podium.