Fog at Auckland International Airport. (File pic) Photo: RNZ / Finn Blackwell
Fog is disrupting Auckland's Airport's domestic services on Monday evening.
Nineteen propeller driven flights heading to or from Auckland Airport have been cancelled or diverted today, said Air NZ.
No international flights had been affected, said the airport.
It is the second time today heavy fog has delayed travellers.
This morning, Auckland Airport said about 30 domestic regional flights had been cancelled and 27 domestic regional flights had been delayed.
Fog restrictions were still in place after sunrise as low cloud blanketed parts of the city.
MetService forecast the fog to return this evening and expected it would last into Tuesday morning before showers developed.
Its meteorologist Stephen Glassey said moisture from an easterly rain front - that crossed the North Island overnight - has been left to linger by cool, still conditions.
Niwa said earlier in the day it expected people's travel plans today could be affected.
Ferry services were also affected by the heavy fog, with a number delayed for up to 30 minutes, and two services cancelled.
But Glassey said wind and showers - over the Auckland area - should see the fog clear by dawn tomorrow.
Meanwhile, orange heavy rain and strong wind warnings are in place for the north-east of the North Island.
A low heading to the region on Tuesday, and moving east on Wednesday, was set to bring heavy rain to Hawke's Bay and Gisborne / Tai Rāwhiti, especially from State Highway 5 to Tolaga Bay, MetService said.