Allas Sea Pool sits on the harbour front at Katajanokanlaituri, directly across from Helsinki’s Market Square and Old Market Hall. Ferries pass close enough that guests watch them from the water.
The layout is a deck built over the Baltic: a heated 25-metre lap pool, a sea pool filled with unheated harbour water, and a cluster of saunas between them. It holds a 4.2 rating from more than 3,800 Google reviews.
What distinguishes it from Helsinki’s other waterfront saunas is scale and choice. Guests can swim lengths, sit in a mixed sauna with a harbour view, or use single-sex rooms — and the sea pool is reached by steps rather than a ladder, which several visitors mention as the reason they managed the cold at all.
What saunas and pools are available at Allas?
There are saunas in two separate zones: the main building and the sea-pool deck. Visitors describe a large mixed sauna with a panoramic window over the bay, plus smaller separate rooms for men and women. Heat levels vary between them, and reviewers note that the room behind the café, which has no view, runs hottest.
The heated lap pool sits around 27 degrees and is long enough for proper swimming — an option Helsinki’s other sauna venues do not offer. The sea pool takes water straight from the harbour and drops to a few degrees in early spring.
Entry is wristband-based, doubling as the locker key. Towels and swimwear can be rented on site, and swimming caps are not required.
Is Allas better suited to families or to sauna purists?
The mixed zones require swimwear, which makes the venue workable for couples, families and groups who want to stay together — a recurring reason visitors give for choosing it. Guests with children describe using the heated pool while adults alternated between sauna and cold water.
Visitors seeking a stricter, traditional sauna will find the single-sex rooms closer to that, though the setting remains a busy urban facility. Among the most appreciated aspects is simply the view: the harbour, the ferries and, for early visitors, sunrise from the sauna window.
Summer weekends are consistently described as very full. Weekday mornings are reported as close to empty.
What should visitors know before going?
Sessions are sold as two-hour slots, and the central location means many visitors combine a session with the market hall or the ferry terminal nearby. Several reviewers specifically recommend it as a last stop before a ferry departure.
Changing rooms and showers exist in both the main building and the sea-pool area, which spreads the load better than a single block. Food and drink are available at an adjacent café, and there is deck seating for warm days.
Directory details
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The verified directory record places Allas Pool in Helsinki’s 00160 postal area. Use the live visit card and map for its current phone number, rating, review count and route link, and confirm details that may change before travelling.
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Frequently asked questions
How many saunas does Allas Sea Pool have?
Visitors describe saunas in two zones: a large mixed sauna with a bay view in the main building, separate men’s and women’s rooms, and further saunas beside the sea pool.
Is the pool heated?
The 25-metre lap pool is heated to around 27 degrees. The sea pool is unheated and takes water directly from the harbour.
Is swimwear required?
Yes in all mixed areas. Swimwear and towels can be rented on site, and swimming caps are not needed.
Is Allas suitable for children?
Visitors regularly describe visiting with children and using the heated pool. The mixed, swimwear-based layout allows families to stay together.
When is it least crowded?
Weekday mornings are described as quiet. Summer weekends are consistently reported as very busy.
Location
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