Japan Meteorological Agency to Establish 'Extreme Heat Day' - Aquaignis Awaji Island Launches New Hot Spring Experience for the Extreme Heat Era. Relax Summer Fatigue with a Lukewarm Bath Near Body Temperature, a New Project on Awaji Island.

Scenic Open-Air Bath Overlooking the Seto Inland Sea (Izunagi no Yu)

Aquaignis Awaji Island (Aquaignis Awaji Island Co., Ltd. / Representative Director: Tetsuya Tachibana), a hot spring resort in Awaji City, Hyogo Prefecture, will launch a "lukewarm open-air bath" from July 2026 during the summer season. This special experience will feature the natural hot spring "Izunagi no Yu," with its open-air bath set to a "neutral temperature" of approximately 35°C, close to body temperature. The rich natural hot spring water, drawn from 1000 meters underground, is delivered in a fresh state through heating, circulation, and filtration. The appeal lies in enjoying a long, relaxing soak without burdening the body while feeling the sea breeze from the Seto Inland Sea. The spring quality is sodium-chloride, characterized by a soft feel on the skin and a gentle warmth that lasts even after bathing. The lukewarm temperature of approximately 35°C allows guests to fully appreciate its comfort. Furthermore, when combined with the "low-temperature mist sauna" adjacent to the indoor bath, it offers a medically luxurious relaxation that gently regulates the autonomic nervous system without straining the heart or blood vessels. It is also expected to help with conditions recognized by the Hot Spring Law, such as "fatigue recovery," "autonomic nervous system instability," and "stress-related symptoms." This proposal offers a new summer bathing experience for those who dislike hot water or intense saunas, allowing them to comfortably reset their mind and body.

[Background of the Project | A New Hot Spring Experience Needed Especially for "Too Hot Summers"]

The Japanese summer is becoming increasingly severe, with the Japan Meteorological Agency set to introduce the term "Extreme Heat Day" (Kokushobi) from the summer of 2026, referring to days with a maximum temperature of 40°C or higher.

- "It's difficult to take a hot bath in the summer."

- "I want to enjoy the hot springs, but I want to avoid sweating too much."

- "I want to cool down more comfortably after using the sauna."

Amidst rising voices like these, Aquaignis Awaji Island has planned a new bathing experience with the theme, "A hot spring you'll want to visit precisely because it's summer."

[Features | Ultimate Relaxation Created by "35°C, Close to Body Temperature"]

1. "Neutral Temperature" for Gentle Bodily Regulation

The open-air bath, using 100% natural hot spring water from 1000 meters underground, is intentionally set to a "lukewarm temperature" of approximately 35°C, close to body temperature. The comfort of this neutral temperature zone, which is neither too hot nor too cold, gently regulates a body flushed from the summer heat.

2. Like Outdoor Bathing Within the Hot Spring

The soft embrace of the water and the sea breeze blowing from the Seto Inland Sea gently cool down a heated body. Unlike conventional high-temperature baths, this lukewarm bath can be enjoyed for extended periods with little strain, offering a unique comfort that makes you want to linger. With the ocean spreading out before you, the sky changing its expression with time, and the serene landscape of Awaji Island, it feels like "outdoor bathing within the hot spring," gently easing summer fatigue and heat.

3. Temperature Design for Safe Enjoyment by Everyone

The temperature is designed to be easily accessible for those who dislike hot water, families with small children, and hot spring beginners. It is also recommended for those looking for "day trip hot springs in Awaji Island," "open-air baths with an ocean view," or "summer trips to Awaji Island." Enjoy a "summer resort time" that gently harmonizes mind and body amidst the overwhelming location overlooking Osaka Bay and the Seto Inland Sea.

[Overview of Natural Hot Spring "Izunagi no Yu" Spring Quality and Indications]

Indoor Bath / Izunagi no Yu; Indoor Bath in the facility / Zatoji (Mist Sauna) Yakuseki (Medicinal Stones)

Chronic pain or stiffness in muscles or joints (rheumatoid arthritis, osteoarthritis, lower back pain, neuralgia, frozen shoulder, chronic stages of bruises and sprains, etc.), muscle stiffness in motor paralysis, cold sensitivity, peripheral circulatory disorders, reduced gastrointestinal function (feeling of fullness, gas accumulation in the intestines, etc.), mild hypertension, impaired glucose tolerance (diabetes), mild hypercholesterolemia, mild asthma or emphysema, hemorrhoid pain, autonomic nervous system instability, stress-related symptoms (sleep disorders, depressive states, etc.), convalescence period after illness, fatigue recovery, health promotion, etc.

Aquaignis Awaji Island

Aquaignis Awaji Island: Spectacular Infinity Hot Spring / Izanami no Yu

As soon as you cross the Akashi Kaikyo Bridge, the extraordinary begins. This is a complex hot spring resort facility located in the northern part of Awaji Island. With the themes of "Food" and "Healing," we offer natural hot springs for complete relaxation, one of the largest infinity hot springs in Awaji Island with a width of 45 meters, restaurants serving local, seasonal ingredients, and trailer accommodation services for an extraordinary experience. Furthermore, we provide comprehensive services for active travelers, including overnight parking, rental bicycles, and RV parks, making it a versatile complex hot spring facility. The trailer accommodation service, offering an extraordinary stay, will begin in June 2025. The trailer park accommodation facility provides a unique lodging experience.

HP: https://www.aquaignis-awaji.jp/

Location: 2-28 Yume-machi, Awaji City, Hyogo Prefecture, 656-2306

Google Maps

TEL: 0799-73-6602 (Main)

Regular Holidays: None *Subject to the closing days of Awaji Island National Akashi Kaikyo Park *Varies by store

Operating Company: Aquaignis Inc. (Head Office: Chuo-ku, Tokyo, Representative Director: Tetsuya Tachibana)

[Access]

🚙By Car

■From Kobe/Osaka Area

Take the Hanshin Expressway and Second Shinmei Road, transfer to the Kobe-Awaji-Naruto Expressway, exit at Awaji I.C., and drive south on National Route 28 for 5 minutes.

■From Tokushima Area

Exit at Higashiura IC on the Kobe-Awaji-Naruto Expressway, and drive north on National Route 28 for 10 minutes.

🚌By Highway Bus

■From JR Shin-Kobe Station, Sannomiya, Maiko Area: Approx. 60 minutes by highway bus → Get off at "Seirei Awaji Hospital Mae" bus stop → 3 minutes on foot.

■For Customers from the Osaka Area: Cross the "Akashi Kaikyo Bridge" on the Kobe-Awaji-Naruto Expressway, exit at Awaji I.C. (with the Ferris wheel), and drive south on National Route 28 for 5 minutes.

- We recommend searching for "Aquaignis Awaji Island" on Google Maps.

- Please note that entering the address into car navigation may lead you to "Awaji Yumebutai."

- Please head to the "National Akashi Kaikyo Park Coast North" parking lot. Our facility is located on the seaside.

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