Sompasauna

About

A free, volunteer-run sauna on the Sompasaari waterfront — no staff, no booking, no rules beyond basic sauna etiquette. Built from salvaged materials and open around the clock in summer. Bring your own towel and an open mind. Helsinki at its most democratic.

Good to know

• Set up outdoors — weather is part of the experience, so dress for the walk between cabin and water.
• Right on the sea — expect saltwater dips between rounds, cold even in summer.
• Urban venue — sits inside the city rather than at a coast or lake, so you can fit a session into a day in town.

Hours

24/7 in summer, limited winter hours