Shirarahama, Shirahama, Wakayama Prefecture
Shirasuna Open-Air Bath
A very affordable swimsuit-required shared outdoor bath during its open season. Shirahama Town's specific 2026 schedule ended on 6 September, so it was no longer available from 7 September that year.
Check before bathing
- Opening hours
- The 2026 seasonal operating period ended on 6 September. Do not plan a visit based on the tourism association's general September weekend listing; the town's specific 2026 dates take precedence.
- Access
- About 15 minutes by bus from Shirahama Station; get off at Shirarahama, beside the beach.
Spring & water temperature
- Spring-source temperature
- 74.0°C at Minekoyu; this is the source temperature.
- Bathing temperature
- Not published.
- Spring source
- Minekoyu spring.
- Spring classification
- Sulfur-bearing, strongly saline sodium chloride spring.
- pH
- 7.2, from the Nanki-Shirahama Tourism Association's Minekoyu data.
- Flow rate
- 190 L/min.
- Water handling
- Shirahama Town identifies a source-flowing open-air bath where mixed bathing requires swimsuits. The town's specific 2026 schedule lists 1–6 September as the final autumn operating period; seasonal operation had ended from 7 September.
Bathing indications
The town lists general bathing indications including cuts and sensitivity to cold. This is facility information, not a treatment guarantee.
Swimsuits are required, and shampoo or other washing products are not allowed. The town's specific 2026 schedule ended on 6 September, despite the tourism association's broader weekend wording. The 74.0°C figure is the source temperature, not the bath temperature.
How to read a bath profile
Spring-source temperature and actual bathing temperature are kept separate. Each score is shown independently for comparison rather than collapsed into one overall score.
