Seaside saunas use the sea as the cold plunge. Most of the venues on this cut are wood-fired barrels or small cabins within a few metres of the tideline, and most of their regulars are year-round cold-water swimmers. January sea is a different animal from August sea, so check the season, not just the forecast, before committing.
In New Zealand, 10 of the curated saunas fit this cut. See the full New Zealand country guide for every venue, or keep scrolling for just the seaside saunas.
Every seaside sauna in New Zealand

ekosauna
$$Waiheke Island, New Zealand
Finnish

Ocean Ember Sauna
$$Christchurch, New Zealand
Finnish
Sauna Collective Orewa
$$Orewa, New Zealand
Finnish

Saunas West Coast
$Greymouth, New Zealand
Finnish

ShareHeat Sauna
$$Lower Hutt, New Zealand
Finnish

Sonder Sauna
$$Auckland, New Zealand
Finnish

The Sauna Project - Plimmerton
$$Porirua, New Zealand
The Sauna Project Coromandel Coast
$$Tairua, New Zealand
Finnish
The Sauna Project Kaikoura
$$Kaikōura, New Zealand
Finnish

The Sauna Project Tairawhiti
$Gisborne, New Zealand
Finnish

