That will mean sporadic falls across the whole island with heavy downpours in places, especially into the afternoon.
However, “it won’t be raining all day for everyone,” Duncan said, with some dry spells mixed in.
Aucklanders have already woken to grey skies and steady rainfall, with MetService tipping possible heavy rain tonight.
The city can expect a top of 20C today with the showers expected to ease tomorrow for a high of 22C.
Whangārei in the north may be set for heavy rain from the afternoon as it heads for a max of 20C, with some heavy falls again tomorrow and a top of 23C.
Tauranga is set for cloud and rain today and a high of 20C, before being hit by heavy falls early tomorrow morning and a top of 19C.
Rotorua is likely to follow Tauranga’s pattern, with rain today and becoming heavy from tomorrow morning as Rotorua hits tops of 17C and 18C.
Hamilton is already being hit by rain and can expect steady showers becoming heavy tomorrow morning with tops of 19C and 21C.
Wellington is expected to remain dry until the evening as it reaches a top of 19C before more steady falls hit tomorrow along with a max of 16C.
Christchurch in the South Island, on the other hand, is looking at a bright and clear Saturday with a top of 17C before some showers tomorrow and a high of 18C.
Dunedin can expect the odd shower in the afternoon and a top of 18C before getting hit by more rain tomorrow and a chilly high of 14C.
Queenstown and most of the West Coast are set for fine days today, with Queenstown set for tops of 18C and 20C today and tomorrow.