Löyly is the wave of steam and heat produced by ladling water onto the hot sauna stones — it raises the humidity and intensifies the warmth you feel, and it's considered the soul of the sauna experience. To make good löyly, ladle a small amount of clean water over the hot stones a little at a time, building the humidity gradually to your comfort rather than drenching them. Use clean water and only sauna-safe scents if any, keep good stones properly arranged for steam, and add löyly considerately when sharing. It's a simple, personal art: start modestly and adjust to how the heat feels.
Ask a sauna enthusiast what makes the experience, and many will say one word: löyly. It’s the wave of steam that rises when you ladle water onto the hot stones — the moment the heat blooms and the room comes alive. Often called the soul of the sauna, löyly is a simple art you shape to your own taste. This guide covers what it is and how to make it well.
What löyly is
Löyly is the burst of steam and heat produced by ladling water onto the hot sauna stones. It:
- Raises the humidity briefly.
- Intensifies the warmth you feel.
Unlike a steam room’s constant saturation, löyly is something you create through the session — shaping the heat and humidity to your liking. The word comes from the Finnish sauna tradition and refers to the steam itself.
How to make good löyly
Good löyly is gentle and measured, not a violent drenching:
- Ensure the stones are hot enough to flash water to steam.
- Ladle a small amount of clean water over them.
- Build the humidity gradually — a little at a time.
- Adjust to how the heat feels, adding more as you like.
Start modestly — you can always add more, and that’s far easier than cooling an overdone, oversteamy room.
How much water?
The stones matter
Good löyly depends on good stones, properly arranged and hot:
- Hot, sound stones flash water cleanly to steam.
- Well-arranged stones (per the heater guidance) allow airflow and steam.
- Old, crumbling stones make poor steam and should be replaced.
If your sauna won’t make good steam, the stones — too cool, poorly arranged, or degraded — are the usual cause (along with using too much water at once).
Water and scents: keep it safe
- Use clean, fresh water — that’s all löyly needs, and it’s wonderful on its own.
- If you want scent, use only sauna-safe scents or essential-oil products made for the purpose, sparingly and per their instructions — often added to the water or a dedicated vessel, not poured neat on the heater.
- Avoid ordinary oils, household additives, or anything not intended for saunas — they can damage the stones or heater and give off unpleasant or unsafe fumes.
Follow the scent product’s and heater manufacturer’s guidance.
Löyly and others
When sharing, remember löyly changes the heat for everyone — so ask before adding it, add it considerately, and respect that others may prefer it drier. It’s part of good sauna etiquette.
Common mistakes
- Drenching the stones all at once, overwhelming the room.
- Cool or degraded stones that make poor steam.
- Non-sauna oils or additives that damage equipment or smell bad.
- Adding löyly without asking others.
- Expecting steam before the sauna and stones are properly hot.
Next steps
Make löyly a simple pleasure: hot, sound stones, clean water ladled modestly and gradually, and only sauna-safe scents if any. Add it considerately when sharing, and adjust to how the heat feels. It’s the soul of the sauna — see how to use a sauna and the temperature guide for the whole experience.
Frequently asked questions
What is löyly in a sauna?
Löyly is the burst of steam and heat produced by throwing or ladling water onto the hot sauna stones. It raises the humidity briefly and intensifies the warmth you feel, and it's considered the soul of the traditional sauna experience. Rather than a constant like a steam room, löyly is something you create through the session to shape the heat and humidity to your liking. The word comes from the Finnish sauna tradition and refers to this steam itself.
How do you make good löyly?
Ladle a small amount of clean water over the hot stones a little at a time, building the humidity gradually to your comfort rather than drenching them all at once. Good löyly comes from hot, well-arranged stones and modest, measured water — a gentle, even steam rather than a violent burst. Add more as you like through the session, and adjust to how the heat feels. Start modestly; you can always add more, and it's easier than cooling an overdone room.
How much water should you put on sauna stones?
A small amount at a time — a ladleful or so — building up gradually rather than drenching the stones. Too much water at once can overwhelm the room, cool the stones and make it uncomfortably steamy, while measured amounts give a pleasant, controllable humidity. Use only as much as suits your comfort and, if sharing, others'. The stones should be hot enough to flash the water to steam; add water gently and adjust to taste. Modest and gradual is the way.
What water should you use for löyly?
Use clean water — clean, fresh water is what's ladled onto the stones for löyly. Some people add a sauna-safe scent or essential-oil product made for the purpose, used sparingly and according to its instructions, but ordinary additives, non-sauna oils or anything not intended for sauna use should be avoided, as they can damage the stones or heater or give off unpleasant or unsafe fumes. Keep it simple with clean water, and only use scents designed and approved for saunas.
Can you add scents to sauna steam?
Yes, but only sauna-safe scents or essential-oil products made specifically for sauna use, used sparingly and per their instructions — often added to the water or a dedicated vessel rather than directly on the heater. Avoid ordinary oils, household additives or anything not intended for saunas, which can damage equipment or produce unpleasant or unsafe fumes. When in doubt, plain clean water gives wonderful löyly on its own. Follow the scent product's and heater manufacturer's guidance.
Why isn't my sauna making good steam?
Usually because the stones aren't hot enough, are poorly arranged, or are old and degraded, or because too much water is being used at once. Good löyly needs hot, well-arranged, sound stones that flash the water to steam, and modest, measured water. Let the sauna and stones get properly hot, arrange the stones for airflow and steam per the heater guidance, replace old crumbling stones, and add water gradually. See our guides on heater stones and replacing sauna stones.
