Widespread fog is disrupting travel in and out of Auckland Airport this morning.
Auckland Transport advised motorists to maintain a safe driving distance on the roads, and said the fog would probably delay ferry services on the city's harbour.
Auckland Airport said fog restrictions had been lifted but warned passengers to expect delays and cancellations.
Those travelling were advised to check flight arrivals and departures on the airport's website or phone app.
The airport said approximately eight domestic flights were delayed and four flights cancelled due to the bad weather.
The 7.20am ferry service from Pine Harbour, Beachlands, was cancelled and will be replaced by a bus. The 8am ferry sailing from Auckland has also been cancelled.
The next scheduled service is due to leave Pine Harbour at 8.20am.
The fog come a day after Auckland suffered its wettest June hour on record,
The downpour left motorists stranded in their cars, workers trapped in a building and countless houses and businesses flooded.
Auckland's Balmoral Road is essentially a river now pic.twitter.com/ijryFhsehp
— Luke Appleby (@lukeappleby) June 29, 2016
Between 1pm and 2pm, Niwa's Mangere weather station recorded 25.4mm of rain. The deluge was part of a miserable afternoon of rain that caused havoc on roads across Auckland until showers cleared about 4pm as the weather system moved towards Bay of Plenty.
At Pukekohe, a police officer helped a disabled girl and her mother who were caught in a flooded car.
Constable Graham Eddy said: "When I arrived the water was up to the windscreen and the woman driver and her daughter were still in there, so I just took it upon myself to offer them assistance I guess."
The pair in the car had to stand on its seats as the water rose and the girl became distressed. She was carried to safety by the woman's partner, who arrived as the drama unfolded.
Fire Service spokesman Jaron Philips said 100 calls were received from Te Atatu Peninsula to Tuakau for flooding-related incidents.
"It was fierce and fast moving," he said. "It was quite busy for us, but not at the worst end of the scale of what we have seen."
In Pukekohe, three people were rescued from a car caught in water on Subway Rd. In Waller St, Onehunga, a worker was trapped upstairs in a factory after the exit downstairs was flooded. "Waves" of floodwaters washed through on Beachcroft Ave.
The Dress Smart mall carpark was flooded, and residents beside the Onehunga Bay Lagoon had calf-deep water in their yards.
Small creeks rose swiftly and photos were posted to social media of gardens and streets swamped by muddy waters. Matipo Primary School in Te Atatu is expected to remain closed today after water got into buildings.
WeatherWatch analyst Philip Duncan said the localised rain was a result of subtropic air feeding the usual winter rain clouds.
"There was 100 per cent humidity, the rain clouds were quite literally forming over Auckland as the slow-moving band of rain was fed by the subtropics."
He predicted more heavy rain events throughout July, with one forecast on Sunday.
