Auckland, North Island flooding: Monday's weather forecast - what you need to know

Heavy rain is expected for northern and central New Zealand on Monday as a strong and humid northeast flow covers the area, with bursts of heavy rain and thunderstorms. 

Auckland saw 40-50mm of rain overnight, which is on top of the deluge the city saw on Friday, MetService broadcast meteorologist Angus Hines told AM on Monday.

He said Northland will bare the brunt of the bad weather on Monday but could get a reprieve in the afternoon. 

"It's still going to be very wet. I know people in the top half of the North Island are extremely sick of the rain now, but unfortunately, I do have to bring the bad news that there's more rain on the way for those northern areas," he told AM host Ryan Bridge. "Northland/Te Tai Tokerau becomes a major area of concern for rain continuing today.

"It is likely to subside… this afternoon, this evening. But that could provide a little bit of false hope because heavy persistent rain is forecast to return to Northland again on Tuesday."

MetService Broadcast Meteorologist Angus Hines
MetService Broadcast Meteorologist Angus Hines Photo credit: AM

The bad news also continues for Aucklanders, with Hines saying the heavy rain that will hit Northland on Monday will move south to Auckland on Tuesday.

"That same band of rain coming in on Tuesday is then going to slide back southwards through Auckland once again, probably towards the end of the day tomorrow," he said. 

"So even if the weather does look like it's clearing later on, on Monday, it's going to be a short-lived reprieve with further rain coming this week."

Hines said Friday's deluge of rain was the wettest day on record and "blew the old record out of the water". 

Below are MetService's latest severe weather warnings:

Heavy rain warnings - orange

Northland - Twenty-four hours from 4am Tuesday to 4am Wednesday

Expect 100 to 140mm of rain in the north and east, with lesser amounts in the west. However, localised areas may receive 140 to 220 mm.

Peak rates of 10 to 20mm/h, mainly in the north and east, but localised areas may see 25 to 40 mm/h, or possibly more. Thunderstorms are also possible.

Note, rain with some heavy falls and possible thunderstorms should ease late morning. A thunderstorms watch is currently in place until 11am on Monday.

Auckland including Great Barrier Island from 6pm Tuesday to 6am Wednesday

Expect 60 to 80mm of rain north of the city but possibly 80 to 120mm in localised places. Less rain is likely about and south of the city but amounts may still exceed warning criteria in some places.

Peak rates of 10 to 20mm/h but localised areas may see downpours of 25 to 40mm/h, especially in the north. Thunderstorms are also possible.