Japanese Onsen: What to Know Before You Go

When I first thought about visiting an onsen in Japan, I had a million questions. What actually happens inside? Do you wear anything? And how do you avoid looking like the clueless foreigner?

If you’re wondering the same, I’ve got you. In this guide, I’ll share everything you need to know about Japanese onsens so you can feel relaxed, confident, and ready to enjoy the experience.

What is a Japanese onsen?

Let’s start with the basics.

A Japanese onsen is a hot spring bath that uses water heated naturally by volcanic activity. Japan has thousands of them, from simple public baths in small towns to luxury ryokans with private open-air tubs.

The big difference between an onsen and a regular hot bath is the mineral content. The water is full of minerals like sulfur, sodium, or iron, and locals believe it helps with everything from skin health to muscle pain.

When I think about the “onsen experience,” it’s more than just soaking. It’s about slowing down, following a rhythm that feels different from daily life, and often staying in a ryokan where you can enjoy the baths as part of the whole stay.

Health benefits of onsen baths

People in Japan have believed in the health benefits of onsen water for centuries. The minerals in the water are said to help with circulation, muscle pain, and even skin health.

Now, I can’t promise a soak will cure everything, but I always feel lighter and calmer after spending time in the baths. Even just taking that quiet moment to breathe feels good for the body.

Different onsens have different mineral compositions, so you might notice some with milky-white water or strong sulfur smells. Locals often choose onsen based on what their body needs most.

How to use a Japanese onsen

If it’s your first time, the process might feel confusing. But really, once you know the steps, it’s simple.

You start in the changing room, leave your clothes in a locker or basket, and carry just the small towel. Then you wash at the shower stations, scrubbing and rinsing carefully. Only after that do you step into the bath.

Once you’re in, just sit quietly and enjoy the heat.

If you’d like a full walkthrough, I’ve written this step-by-step guide: How to use a Japanese onsen.

What to wear at an onsen

This one’s easy. Inside the baths, you don’t wear swimsuits. Everyone bathes nude, and the only thing you bring with you is a small towel.

But you don’t walk around completely unclothed the whole time. In ryokans, you’ll usually wear a yukata robe provided in your room. You’ll see everyone dressed the same, walking around the inn, and even going to dinner in it.

Some towns, like Kinosaki, encourage you to wear it while strolling between public baths.

Onsen etiquette you should know

Now that you know what to wear, let’s talk about how to act once you’re inside. Onsen etiquette might sound intimidating at first, but once you’ve done it once, it all makes sense.

• Wash before soaking: Use the shower stations to scrub and rinse well before you step into the bath.
• Keep towels out of the water: Fold your small towel and set it aside or place it on your head.
• Stay quiet: You can chat softly, but onsens are about calm, not loud conversation.
• Tattoos may be restricted: Some baths still don’t allow them, so check in advance or book a private onsen.
• Tie up long hair: Keep it out of the water for cleanliness.
• No phones: Changing rooms and baths are phone-free zones.
• Clean up after yourself: Rinse the stool or bucket you used and leave the area tidy.

Different types of Japanese onsen

Not every onsen looks or feels the same. Some are indoors with polished wooden tubs, while others are rotenburo, open-air baths set in gardens or mountains. Then there are more unusual ones, like sand baths, mud baths, and even cave baths.

The water itself changes too. I’ve stepped into clear baths, milky-white ones, and even springs tinged with green or red depending on the minerals.

If you’re wondering which type might be right for you, I share more here: Types of onsen baths in Japan.

Best onsen towns in Japan

With so many hot spring towns, it can be tough to decide where to go.

If you’re near Tokyo, Hakone is the easiest choice. Kusatsu is famous for its strong, healing waters, while Kinosaki is loved for walking around town in yukata robes as you hop between seven public baths.

On Kyushu, Beppu and Yufuin both stand out, though each feels very different. Smaller towns like Kurokawa or Ginzan offer a quieter, traditional experience with wooden ryokans and narrow streets.

I’ve rounded up my favorites here: Beautiful onsen towns in Japan.

Staying in a ryokan with onsen

For me, the best way to experience an onsen is to stay in a ryokan.

These traditional Japanese inns give you more than just a bed. You’ll sleep on tatami floors, wear a yukata robe, and enjoy multi-course kaiseki meals. Add a hot spring bath into the mix, and it feels unforgettable.

Ryokans can be traditional or modern, with shared baths, private tubs, or sometimes even in-room onsen. Prices are per person and include dinner and breakfast, which makes them different from a regular hotel.

Not sure where to start? Check my full guide: How to choose a ryokan in Japan.

Tips for first-timers

If you’re new to onsens, a little prep goes a long way. Here are a few things I always tell friends before they try one:

• Don’t soak too long on your first try. The water is hotter than it looks.
• Bring a hair tie if you have long hair. It’s polite to keep it out of the water.
• Book a private onsen if you’re nervous. Many ryokans have them, and it’s a great way to ease into the experience.
• Try different times of day. Morning baths are quiet, while night soaks under the stars feel special.
• Drink water after your soak. You’ll sweat more than you realize.