An Auckland winter rarely gets truly cold. It gets wet, then bright, then wet again, often before lunch. Dressing for it is less about warmth than about adapting.
The merino rule: your first layer should be merino. It breathes when the sun comes out and keeps you warm when the southerly arrives. A fine merino tee or a half-zip pullover does both.
The merino rule: your first layer should be merino.
Over that, a shell that actually keeps the rain out. Seam-sealed, with a hood that stays put. Choose one that packs small so it lives in your bag from May to September.
Finish with a boot that can handle a wet footpath. Leather with a rubber sole, or a shearling-lined pull-on for the coldest mornings.