Meanwhile in the South Island, Christchurch and Ashburton are heading for 17C and 15C respectively, a sharp drop from the 25C and 23C felt yesterday.
The capital is looking to a milder 18C today, also a cool change from 26C earlier in the week.
The top of the South is set for a warm 20C in Blenheim and 21C in Nelson, with a cold front bringing the risk of thunderstorm development over the Nelson ranges today.
There is also a low risk for severe thunderstorms in parts of the North Island.
Niwa reports that apart from locally heavy showers in parts of the North Island today, the country can expect little to no rainfall over the coming few days.
Yesterday some stores reported short supplies of items such as splash pools, fans, gazebos and chilly bins, after a rush on tools to help Kiwis beat the heat this Summer.
The Warehouse Newmarket said they had sold out of standing fans, gazebos and some splash pools two weeks before Christmas.