Heavy fog also shrouded much of the city’s motorway network, making driving difficult, and delayed ferry services.
MetService forecaster Lewis Ferris said it was a mixing pot of bad ingredients that was causing the fog to hang around.
He said MetService was expecting visibility to increase from now until midday as the sun begins to heat up the ground.
Ferris said the sun’s low angle due to the winter solstice, high clouds blocking the sun, and the lack of wind, made for the perfect foggy conditions.
Flight restrictions were put in place shortly before 3am, Auckland Airport said in a statement.
The airport said that as of 9.30am, 41 domestic regional flights had been cancelled and 30 domestic regional flights have been delayed, due to the fog.
Three flights from Christchurch, two flights from Wellington, and one flight to Wellington have been delayed.
However, flights to Christchurch and Queenstown had been cancelled for reasons unrelated to the fog, an airport spokesperson said.
Passengers are advised to check the airport’s website or app for the latest information on their flight.
Auckland Transport said the fog had caused delays to some ferry services to and from downtown Auckland, including Bayswater, Hobsonville and Beach Haven, Gulf Harbour, Pine Harbour, and Birkenhead. Several sailings were cancelled or 30 minutes or more late.
Video taken from the Hobsonville ferry terminal at about 7.20am shows pea-soup fog covering the water, with low visibility.
Due to heavy fog, the following ferry service between Downtown and Hobsonville/Beach Haven will be delayed up to 30 Minutes: • Downtown to Beach Haven via Hobsonville 06:25, 07:05 • Beach Haven to Downtown via Hobsonville 07:00 pic.twitter.com/SHuvoWp4rR
— Auckland Transport Travel Alerts (@AT_TravelAlerts) June 23, 2024
Due to heavy fog, the following ferry services between Downtown and Birkenhead will be delayed up to 15 Minutes: • Downtown to Birkenhead 06:15, 07:35 • Birkenhead to Downtown 06:50, 08:15 pic.twitter.com/8DNzvQ8GlQ
— Auckland Transport Travel Alerts (@AT_TravelAlerts) June 23, 2024
Due to heavy fog, some ferry services between Bayswater and Downtown may be delayed up to 15 minutes this morning. pic.twitter.com/4q9V8kNSlr
— Auckland Transport Travel Alerts (@AT_TravelAlerts) June 23, 2024