Thick fog has led to cancellations and delays of regional flights at Auckland Airport this morning.
Air New Zealand said 36 regional flights have been cancelled and 29 had been delayed.
Another six flights to and from Wellington, Dunedin, Christchurch and Queenstown have also been affected. International flights are still running to schedule.
Heavy fog yesterday saw flights out of Auckland Airport cancelled and delayed and contributed to huge congestion problems on Auckland's motorways after crashes held up commuters heading in and out of the city.
MetService forecaster Philippa Murdoch said the fog was expected to last until late morning today.
It would give way to a few fine spells this afternoon, though there would be some showers later in the afternoon and in the evening. Showers will continue throughout the weekend in Auckland.
A low crossing the North Island would bring rain to eastern parts of the island, from Gisborne to Wairarapa.
There could also be some light showers in Northland later today, which will move down the country as far as Taihape later in the day.
A front is crossing the bottom of the South Island, bringing rain to Fiordland and later Otago and Southland. There will also be some drizzle down the coast from Marlborough to Banks Peninsula.
Morning fog then partly cloudy and chance of a shower. Southwesterlies. High 18C, Low 11C
Morning fog or low cloud, then fine spells. Isolated evening showers. Southwesterlies. High 17C Low: 12C
Cloud and fog, clearing for a time this afternoon. Southwest breeze developing. High: 16C Low: 8C
Cloudy periods. Light winds. High: 18C Low: 11C
Cloud and fog, clearing for a time this afternoon. Southwest breeze developing. High: 15C Low: 9C
• New Plymouth
Cloudy periods. Light winds. High: 17C Low: 10C
Mostly cloudy, late rain. Light winds. High: 17C Low: 11C
Fine spells, but rain about the eastern hills, clearing afternoon. Southeasterlies. High: 16C Low: 10C
Low cloud and occasional drizzle. Northeasterlies. High: 15C Low: 9C
Cloudy. Rain from late evening as northeasterly turn southwest. High: 14C Low: 9C