Amsterdam keeps its outdoor saunas in gardens and on the water rather than inside spa buildings. The stoves are mostly electric, which is the Dutch pattern.
The plunge is standard, and at some sites it is a lake rather than a tub. A session here is a habit, not an outing.
In Amsterdam, 6 of the curated saunas fit this cut. See the full Amsterdam guide for every venue, or keep scrolling for just the outdoor saunas.
Every outdoor sauna in Amsterdam

Badhus Amsterdam
€Amsterdam, Netherlands
FinnishFloating

Kuuma Amsterdam Aan 't IJ
€Amsterdam, Netherlands
Finnish

Kuuma Amsterdam Marineterrein
€Amsterdam, Netherlands
Finnish

Kuuma Amsterdam Noord
€Amsterdam, Netherlands
Finnish

Kuuma Amsterdam Sloterplas
€Amsterdam, Netherlands
Finnish

Private Sauna @ De Ceuvel
€€Amsterdam, Netherlands
Finnish