Lonna Sauna
A log-built public sauna on Lonna, a 150-metre island between Helsinki's Market Square and Suomenlinna, designed by OOPEAA and opened in 2017. Two loft saunas are heated by wood-burning stoves, nine steps above the washing rooms, and the dip is straight off the rocks into the sea.
WhatBathhouse, HelsinkiFinland
WhenClosed for the winter until May 2027Sea dip from the rocks. The operator warns the path into the water is rocky, that the stones shift because of nearby shipping traffic, and recommends footwear.
Getting there Boat
AccessNo private hire of the public sauna. Reservation strongly recommended; walk-in only if seats are free. Licensed area.Timed tickets
Getting in
- Public transport
- FRS Finland waterbus from the Keisarinluodonlaituri pier at Market Square (between the Suomenlinna HSL ferry and the Korkeasaari ferry), about 10 minutes; Lonna is 1.5 km from the mainland. No guest dock, private boats cannot land. The last FRS schedule published for 2026 ran 16 August to 30 September.
- Address
- Lonna island, 00190 Helsinki
Entry, hours and rules
- Official site
- lonna.fi
- Facilities
- SaunaChanging roomsShowersToiletsRestaurantCaféTowel hireStep-free access