Hotel Hoshitori Terrace Sekigane

Spring-source temperature

39–45°C across the facility's spring supply; not a fixed temperature for one bath

Bathing temperature

Not published

Spring source

Sekigane Onsen water

Spring classification

Simple radioactive spring (low-tonicity, weakly alkaline, hot spring)

pH

Not published

Flow rate

Not published

Water handling

The hotel specifically describes the outdoor bath as free-flowing. Current material does not confirm that every public bath uses the same system.

Day use was suspended as of the September 8, 2026 check; a notice planned resumption for September 10, but the current status must be reconfirmed. Tuesdays, Wednesdays and maintenance days are usually not day-use days. Tattoo rules are unconfirmed.