Flights and ferries have been delayed in Auckland due to heavy fog.

The fog restrictions at Auckland Airport have been lifted.

Twelve domestic flights were delayed and 17 domestic flights were cancelled, due to the fog.

One international flight from Guangzhou, China - flight number CZ335 - was diverted to Christchurch airport.

A line of commuters wait for ferries at the Devonport ferry terminal. Photo / Supplied via Campbell Gibson
A line of commuters wait for ferries at the Devonport ferry terminal. Photo / Supplied via Campbell Gibson

International flights were also not affected.

Passengers were being asked to check Auckland Airport's website or its app for the latest flight arrival and departure information.

Most ferry services were delayed and the New Zealand Transport Agency thanked passengers for their patience.

Dozens of commuters were on the Devonport Ferry Terminal wharf around 8am today, lining up for boats, delayed by fog.

The travellers trying to get across to the city were left fuming about the situation.

Queues stretched from incoming boats down the length of the wharf.

Yesterday, fog blanketed much of the city and the upper North island.

It caused traffic disruptions and delays to ferry services.

Auckland Transport tweeted that Birkenhead and Northcote Point ferry passengers may face delays because of fog on the western side of the Harbour Bridge.

West harbour passengers were also due to face delays.

Warm temperatures stick around

The unseasonably warm autumn temperatures are to continue with forecasters predicting record or near-record temperatures in parts of the country.

April's warmer trends are expected to stick around and keep winter at bay this month.

MetService Meteorologist Georgina Griffiths said autumn had been "remarkably warm".

Last month was sunny, warm and dry around many parts of the country; Nelson recorded its sunniest April ever with a total of 248 hours of sunshine.

According to MetService, it was the fourth month running above average temperatures - typically 1 to 1.5C above normal - were felt throughout New Zealand.

Southland was particularly warm, with temperatures 2C above the April average and was the second warmest April on record in Invercargill.

Ensuring an equally milder May for most parts of the country were the northwesterly winds, coupled with warm seas.

Monthly temperatures were signalled to run to the order of 1.5C to 2C above the May norm, which would herald record or near-record warmth in some locations.

This didn't rule out any cold or frosty spells, but MetService was predicting this would be less than usual.

Auckland will be warm and sunny for most of the week, with a high of 22C sticking around till Saturday.

Some cloud is forecast, with the chance of showers over the coming days, but it will be largely fine.

Wellington is forecast to be a little cooler, with a high of 19C today and tomorrow and a fair bit of cloud with some showers turning to rain tomorrow.

The weather is expected to clear by the weekend with a high of 19C on Saturday and 16C on Sunday.

Christchurch looks set to hit an unseasonably warm high of 24C today, though strong northerly winds and high clouds are also forecast for the southern city.

The weekend is expected to be slightly cooler, with a high of 19C on Saturday and Sunday, but the sun will be making a strong appearance on Saturday.