There were 56 cases in the city yesterday, the highest since 1 September, with three in Waikato and one in the Bay of Plenty.
But there was also hope, as first-dose vaccination rates hit 86 percent.
Covid-19 modeller professor Shaun Hendy said as cases trend upwards, the outbreak was at a critical point.
"It is possible that we could end up in the triple digits so that's something that the government should be considering and it should be developing a plan for what happens ... because that will put real strain on the health system in Auckland," he said.