Open data
The whole atlas, free to reuse: 104 sauna records across 9 municipalities of the Helsinki region, 85 of them verified against the operator’s or the city’s own page. Last checked 2026-10-01.
Download
Licence: CC BY 4.0. Reuse with the attribution “SaunaHash atlas, saunahash.com”, plus the open-data attributions under Sources. 101 of 104 records carry coordinates.
The sea temperature is Finnish Meteorological Institute (FMI) open data, CC BY 4.0: “The Creative Commons Attribution 4.0 International license (CC BY 4.0) shall be used by the Finnish Meteorological Institute's open data service.” (FMI open-data licence).
What a record carries
One record is one sauna a person can enter, book, or use as a member or guest. Shops, place names and sub-units are left out.
- id
- Stable record id. Never reused, never renumbered.
- name
- The name the operator or the city uses.
- type
- What kind of sauna it is, in plain words: swimming-hall sauna, sauna raft, seaside public sauna…
- access
public(walk in or buy a ticket) ·rentable(book the whole sauna) ·private(members, residents or guests).- address · municipality
- Street address and the municipality it sits in.
- coords
- Latitude and longitude (WGS84), where a source gives a point.
- status
verified·disputed(sources disagree; recorded, not resolved) ·closed·seed(known from open data, not yet confirmed by the operator).- verified_at · verifier
- The day the record was checked at source, and who checked it.
- sources[]
- Every page the record rests on: URL, licence and the day it was read.
- hours
- Opening hours by weekday where the operator states them, with the source and the day they were read. Null means not recorded — never “closed”.
- price_from
- The lowest adult entry price in euros, where stated, with its source.
- sea_swimming
- Whether the operator says you can swim in the sea there, with its source.
- booking_url
- The operator’s own booking page, where one exists.
Coverage
| Municipality | Known | Verified | Disputed | Closed | Not yet verified |
|---|---|---|---|---|---|
| Helsinki | 68 | 58 | 3 | 2 | 5 |
| Espoo | 19 | 14 | 3 | 2 | 0 |
| Vantaa | 9 | 8 | 0 | 0 | 1 |
| Kirkkonummi | 3 | 1 | 2 | 0 | 0 |
| Inkoo | 1 | 1 | 0 | 0 | 0 |
| Kauniainen | 1 | 1 | 0 | 0 | 0 |
| Sipoo | 1 | 1 | 0 | 0 | 0 |
| Siuntio | 1 | 1 | 0 | 0 | 0 |
| Vihti | 1 | 0 | 0 | 0 | 1 |
Method: each record was checked on 2026-10-01 against the operator’s or the city’s own page, plus the licensed open-data unit where one exists. Verified: name, address, access and operation confirmed at source. Disputed: sources disagree and the disagreement is recorded, not resolved. Closed: the operator or the city says so. The Helsinki list shows the Helsinki records; the dataset carries every municipality.
Sources
Operator and municipal pages contribute facts only; no text or images are reused. The open-data fields keep their own attribution:
- Pääkaupunkiseudun palvelukartta, City of Helsinki, CC BY 4.0 · retrieved 2026-10-01
- Lipas.fi, Jyväskylän yliopisto (University of Jyväskylä), CC BY 4.0 · retrieved 2026-10-01
- Finnish Meteorological Institute (FMI) open data, CC BY 4.0 · retrieved 2026-10-09
Cite this
SaunaHash (2026). SaunaHash atlas — Helsinki region sauna records, verified at source [dataset]. Updated 2026-10-01. CC BY 4.0. https://saunahash.com/open-data/
Spotted something wrong?
A sauna closed, a price changed, one is missing? Write to hello@saunahash.com with the sauna and the page that says so. Corrections are checked at source like every other record.