The first thing most newcomers to sauna ask is: how hot should it be? The honest answer is that it depends on you — but there are useful benchmarks to work from.
The Finnish Standard
Traditional Finnish saunas run between 80°C and 100°C (176°F–212°F) at bench level. At this range, the air feels dry and the heat wraps around you rather than burning. Humidity is added in short bursts by ladling water over the rocks — a ritual called löyly. Each ladle raises the perceived heat sharply for 60–90 seconds, then dissipates.
Lower Heat, Longer Sessions
If you're new to sauna, or if you enjoy a more meditative experience, 70°C–80°C (158°F–176°F) is a better starting point. The heat penetrates just as deeply given time; you simply stay longer. Many experienced bathers prefer this range precisely because it allows 20–30 minute rounds without discomfort.
High Heat (Over 90°C)
Competitive sauna enthusiasts and long-time Finnish sauna-goers often push into the 90°C–100°C range. At this temperature, you'll want to wet your hair before entering, protect your ears, and sit lower on the bench if you need relief — the temperature differential between the lower and upper bench can be 20°C or more.
Using a Thermometer
A quality sauna thermometer removes the guesswork. Mount it at sitting head height on the upper bench — this is the most accurate reading of the heat you're actually experiencing. Thermometers placed on the wall near the stove will read 10–15°C higher than reality.
The Right Humidity
Dry heat (low humidity) feels cooler at the same temperature than humid heat. A good sauna session balances both: heat the room fully before throwing water on the rocks, and use small, frequent ladlings rather than one large pour. About 40–60% relative humidity is the traditional Finnish sweet spot.
Experiment across a few sessions. Your body will tell you what it likes — and over time, you'll find yourself naturally gravitating toward the temperature and rhythm that works best for you.
