The hot and sticky tropical weather continues for the North Island with only a brief respite before the potential landfall of Tropical Cyclone Gita early next week.
Auckland had a dew humidity point of 23C, and it was even 22C in Wellington.
MetService New Zealand lead meteorologist Michael Martens said a tropical trough hovering over the North Island was behind the "incredibly humid conditions".
Martens said that mean fog, or 100 percent humidity was likely this morning.
"That is unheard of. It is what you expect in the Cook Islands and the tropics."
A westerly change will bring dry air and a pleasant high for Thursday and Friday but the humidity returns as Tropical Cyclone Gita enters the Tasman Sea.
The category 4 cyclone passed just below Tonga overnight, hitting the nation with winds of 195km/h and 150-250mm of rain.
It is now moving towards the southern islands of Fiji and is likely to become a category 5 cyclone today.
Tropical Cyclone Gita is scheduled to pass south of New Caledonia on Saturday before travelling south into the Tasman Sea.
"Early next week there is a chance it may reach New Zealand, but the model is still uncertain," Martens said.
"Once it moves out of the tropics and the sea temperature decreases it will lose a lot of its power.
"Even if it gets up to a category 5 it will likely be a 3 or a mid-level 2 storm if it reaches here."
Heavy rain fell overnight around Northland, Auckland and through to Taupo and more is expected for the day for most areas north of Taupo, as well as potential thunderstorms.
The South Island is mostly fine today, except for a weak front hitting parts of the West Coast.
"Rain should ease there today. A few fronts will arrive there later in the week, though the East Coast should be relatively fine," Martens said.
