Widespread fog caused travel chaos in and out of Auckland Airport this morning.
Fog restrictions at Auckland Airport have now been lifted but approximately 24 domestic flights were delayed and 25 cancelled this morning.
Seven international flights were also slightly delayed, but all have now left Auckland.
Passengers are advised to check flight arrivals and departures on the Auckland Airport website or phone app.
Auckland Transport was earlier advising motorists to maintain a safe driving distance on the roads.
The main trunk routes to Wellington, Christchurch, Dunedin and Queenstown was not affected by the fog.
The fog came a day after Auckland suffered its wettest June hour ever recorded.
The downpour left motorists stranded in their cars, workers trapped in a building and countless houses and businesses flooded.
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.