We moved to Rovaniemi, Finnish Lapland a few years ago and one thing caught us off guard: sauna here is not a spa treat. It’s a Thursday ritual, a way to mark midsummer, and the social glue between a lake swim and a cold beer on the dock. We’ve since made it our mission to try the best sauna Finland has to offer — not just the polished tourist versions, but the smoky, crumbling, utterly genuine ones too.

Summer is when best sauna Finland truly comes alive. The evenings stretch past midnight, the lakes are warm enough to swim in, and the birch whisks are fresh and fragrant. If you’re visiting Finland between May and August, this guide covers exactly what to book and why.

Why summer is the best time for sauna in Finland

Most visitors assume sauna is a winter thing — a way to warm up after standing in the snow. That’s not wrong, but summer sauna is something else entirely. In Finland, the sauna season that locals actually look forward to runs from late May through August, when the combination of warm lake water, long evenings, and fresh birch leaves makes every session feel like a ritual.

What makes summer sauna special

• The lake swim. In July, many Finnish lakes reach 22–24 °C. Going from a 90° sauna into that water is the closest thing to perfect.
• Fresh birch whisks (vihta). Birch is harvested in June–July when the leaves are full and aromatic. Beating yourself gently with a fresh vihta releases oils that smell incredible and open up your pores.
• The light. Sauna at 10 pm in Lapland means birchwood-filtered sunlight still glowing over the lake. Nothing else looks like it.
• Midsummer (Juhannus). Around June 19–20, Finland essentially shuts down for a nationwide sauna-and-bonfire weekend. It’s the single best weekend to experience sauna culture as a visitor.

The best city saunas to visit in summer

Not everyone is renting a lakeside cottage — and you don’t need to. Finland’s cities have invested seriously in public sauna culture. These are the ones worth planning your visit around.

Helsinki: Allas Sea Pool and Löyly

Helsinki has two saunas that consistently land on every “best of” list, and for once the hype is deserved.

• Allas Sea Pool (South Harbour): three pools (heated, sea-temperature, and children’s) plus two saunas — one traditional, one smoke. In summer the outdoor terrace fills with Helsinki locals. Book online; it sells out on Friday evenings.
• Löyly (Hernesaari): architecturally striking, right on the sea. The sauna itself is a cedar-lined gem, but the real draw is the outdoor terrace and the bar. Better for a social evening than a traditional sauna experience.
• Kotiharju Sauna (Kallio): the oldest public sauna still running in Helsinki, opened in 1928. No frills, no design awards — just real neighborhood sauna at €15 a head. Go here if you want to understand what sauna meant before Instagram.

Tampere: Rajaportin Sauna

Tampere calls itself the sauna capital of Finland, and the claim is defensible. Rajaportin Sauna, opened in 1906, is the oldest continuously operating public sauna in the country. It runs on wood, costs almost nothing, and feels absolutely authentic. Pair it with a swim in Näsijärvi or Pyhäjärvi lake just minutes away.

Kuopio: Kümas and the Smoke Sauna Capital

Kuopio is where you go for the smoke sauna (“savusauna”) in its most serious form. Kümas is a dedicated smoke sauna experience run by the local sauna society, heated for hours in advance and offering a genuinely otherworldly atmosphere — dark, tar-scented, and almost meditative. It takes bookings seasonally and fills up weeks ahead in July.

Quick-reference: sauna types and what to expect

Finland has several distinct sauna types. Knowing the difference before you book will save you from disappointment — and help you pick the right experience for your trip.

• Electric sauna (äly-sauna / sähkökiuas): the most common type in apartments and hotels. Fast to heat, consistent temperature, easy to find. The steam (löyly) is lighter. A good everyday sauna; not the most atmospheric.
• Wood-burning sauna (puukiuas): heats slowly over 2–3 hours, holds heat longer, produces a fuller, rounder steam. Most lakeside cottage saunas run on wood. This is the standard for the Finnish summer experience.
• Smoke sauna (savusauna): the original Finnish sauna. No chimney — the fire heats the stones and the smoke fills the room, then you ventilate before bathing. Incredibly soft heat, tar-and-birch scent, meditative calm. Worth going out of your way for.
• Floating sauna (lauttasauna): a sauna on a raft or dock, increasingly popular in cities. Helsinki, Tampere, and Oulu all have them. Jump directly from the sauna into the lake or sea.
• Tent sauna (teltttasauna): portable and light — popular for camping trips. You’ll see them at canoe campsites across Lakeland Finland. Not the most luxurious but genuinely fun.
• Sauna yacht / sauna boat: Helsinki has a few boats that combine a proper sauna with a cruise around the harbour archipelago. Gimmicky? A little. Worth it? We think so for the views.
• Cottage sauna (mökkisauna): renting a Finnish summer cottage (mökki) means you get your own private sauna by a lake. This is the most authentic possible experience and absolutely our top recommendation.
• Resort spa sauna: found at ski resorts like Levi, Ruka, and Saariselkä. Tend to be well-maintained and larger, but more commercial in feel. Great for groups.

Sauna etiquette tips for first-timers

Finnish sauna has unwritten rules. Locals won’t tell you if you break them — they’ll just be quietly mortified. Here’s what to know before you go in.

• Go in naked. In mixed company, bring a towel to sit on, but Finns do not wear swimwear in the sauna itself unless it’s specifically a public pool-type setting. Allas Sea Pool is an exception (swimwear required in the outdoor pools).
• Ask before throwing water. Throwing water on the stones (kiuas) raises the humidity and temperature suddenly. Always check with your sauna companions before doing this.
• Sit quietly. Sauna is not a party venue. Conversation is fine, but loud music or rowdiness is considered rude. Especially in smaller public saunas.
• Go in, cool down, repeat. The traditional Finnish sauna rhythm is: heat session (10–20 min), then step outside or jump in the lake to cool down, then go back in. Two to four rounds is typical.
• Leave your phone outside. Or at least don’t take photos of other people without explicit permission. In a public sauna this applies firmly.
• Hydrate before and after. Sauna dehydrates you faster than you’d expect, especially in summer. Water is fine; the cold beer tradition is real but comes after, not during.

Smoke sauna vs. electric sauna: which to try first

We get this question a lot. Smoke sauna sounds more authentic — and it is — but it’s also harder to find and significantly more expensive when sold as a tourist experience. Here is our honest breakdown.

• Electric sauna: good for everyday use, understanding the basics, and getting comfortable with the routine. If you’re staying in an apartment or hotel in Helsinki, you’ll likely have access to an electric sauna. Use it.
• Wood-burning sauna: the step up. Softer heat, better steam, more ritual in the preparation. Most lakeside cottage saunas in Finland run on wood. If you’re renting a mökki, you almost certainly have one. This is where real Finnish sauna culture lives.
• Smoke sauna: the bucket-list experience. The heat is uniquely soft and penetrating, the scent is extraordinary, and the whole experience feels like something ancient. Worth seeking out at least once. Kümas in Kuopio and the smoke sauna at Allas Sea Pool are the most accessible options for summer visitors.
• The honest trade-off: smoke sauna requires hours of preparation, is more expensive, and available only at specific times. Electric is immediately accessible. For most first-time visitors, we say: do a wood-burning or electric sauna first to understand the rhythm, then plan a specific smoke sauna experience as the centrepiece of a day.
• If you can only do one: rent a cottage with a lakeside sauna for one night. That single experience — wood smoke, lake, birch whisk, silence — is the essence of Finnish summer.

Mistakes we made (so you don’t have to)

• Not booking ahead. The best public saunas in Finland fill up weeks in advance in summer, especially on Fridays and Saturdays. We once drove two hours to Kümas with no reservation. Do not be us.
• Going in too long on the first session. Twenty minutes in a 90° sauna sounds fine until it isn’t. Your first round should be 10–12 minutes, maximum. Let your body acclimatise before you push longer.
• Wearing the wrong footwear. Sauna docks and changing rooms get slippery. We’ve both nearly gone in before we were ready. Bring flip-flops.
• Skipping the lake swim. It sounds cold even in summer. It isn’t — and the contrast is the whole point. Every time we’ve skipped the swim, we’ve regretted it. Even a 30-second dip changes the entire experience.
• Treating it like a spa. Finnish sauna isn’t about relaxation music and scented candles. It’s quieter and more stripped back than that. Slow down, stop checking your phone, and let the whole ritual take its time. It takes at least two hours done properly.
• Forgetting the vihta. If you are anywhere near birch trees in June or July, ask your host if there is a fresh whisk. The scent alone is worth it. Dried whisks from a shop are a substitute, not a replacement.

Frequently asked questions

A final word from Rovaniemi

We’ve spent years trying to explain Finnish sauna to friends who visit from Ukraine, the UK, and beyond, and the thing we always come back to is this: it’s not really about the heat. It’s about the pace. The complete permission to sit still, to talk or not talk, to be uncomfortable and then very comfortable, and to repeat the whole thing as many times as you like.

In summer, the best sauna Finland has to offer adds one more layer: the lake is warm, the sky is gold at midnight, and the birch smells like the beginning of something. If you can carve out even one evening for it during your trip — especially around Midsummer — do it.

Book ahead, bring flip-flops, skip the phone, and don’t rush the swim. The sauna will wait.

— Joona & Alla, Rovaniemi