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

Aucklanders have woken to heavy rain, surface flooding and inundated houses as the city gets hit by another deluge.

Fire and Emergency confirmed multiple homes in Devonport, Royal Oak, Mount Roskill and Lynfield have requested help.

MetService's "red" heavy rain warning is set to end at 8am on Wednesday, while the "red" warning for Northland lapsed at 4am. 

MetService broadcast meteorologist Angus Hines told AM on Wednesday Auckland is being lashed by heavy rain but added "it shouldn't last all that long". 

"A narrow band of quite heavy rain which is just starting to kick off. That same flooding, those same severe weather impacts that we saw towards the end of last week and across the weekend, this extra rain is just meaning that is happening all over again in some parts of Auckland," Hines told AM co-host Ryan Bridge. 

"The positive news is it shouldn't last all that long as the rain is going to continue to transition across the country. So a couple more hours of heavy rain through Auckland before those warnings do start to subside."

Below is MetService's latest forecast: 

Short forecast for Auckland - Wednesday 

Heavy rain and possible thunderstorms, easing to a few showers in the morning. Strong northeasterlies, gusting 100 km/h in exposed places, easing this morning.

Short forecast for Coromandel and Bay of Plenty - Wednesday 

Rain with heavy falls, and possible thunderstorms for Coromandel, easing in the west during afternoon or evening.

Short forecast for Waikato to Taranaki, including the central high country - Wednesday 

Periods of rain, heavy at times, with possible thunderstorms about Taranaki from evening.

Extended forecast North Island 

Rain, possibly heavy in the Bay of Plenty and Rotorua. Isolated showers elsewhere, widespread in the afternoon and evening, with possible thundery falls in Taranaki, Whanganui, Manawatu and Wairarapa.