Sauna: temperature, time and the contrast
A Finnish sauna runs between eighty and one hundred degrees with very low humidity, in sessions of eight to fifteen minutes followed by cooling and rest, and that cycle is normally repeated two or three times.
gelisted editorial team · Updated 15 August 2026
The short version
- A Finnish sauna runs 80 to 100 degrees at 10 to 20 per cent humidity.
- A steam room runs about 45 degrees at near saturation.
- Each session lasts 8 to 15 minutes.
- Rest between sessions should be at least as long as the session.
A sauna is not about enduring. It is about repeating a cycle of heat, cooling and rest, and anyone who skips the third part gets half the effect.
Sauna and steam room
A Finnish sauna is dry heat: high temperature with very low humidity, which is what makes figures tolerable that would be unbearable in a humid environment. A steam room runs at a much lower temperature but with humidity close to saturation, so the sensation is intense at 45 degrees. The sauna usually feels more demanding and the steam room more enveloping.
| Installation | Temperature | Humidity |
|---|---|---|
| Finnish sauna | 80 to 100 °C | 10 to 20 % |
| Mild sauna | 60 to 75 °C | 20 to 35 % |
| Steam room | 43 to 48 °C | close to 100 % |
| Session length | 8 to 15 minutes | |
| Cooling | 1 to 3 minutes | cold shower or pool |
| Rest between sessions | 10 to 20 minutes | |
| Cycles per visit | 2 or 3 |
The full cycle
Shower and dry first. A heat session of 8 to 15 minutes, seated, leaving earlier if any discomfort appears. Progressive cooling for 1 to 3 minutes, starting at the feet and legs and working upward, never straight onto the trunk. Rest of 10 to 20 minutes with the feet raised, taking fluids. Then repeat, for a total of 2 or 3 cycles per visit.
Common mistakes
Staying longer than intended in the belief that it works better that way. Skipping the rest, which is where the body recovers. Going in after a heavy meal. Not taking fluids, when 2 or 3 cycles can lose an appreciable amount. And combining a sauna with intense exercise on the same day, which is better separated by at least an hour.
A towel under the body is a hygiene rule in every facility rather than an optional courtesy.
When to avoid it
With uncontrolled cardiovascular disease, marked low blood pressure, fever or acute infection, and during pregnancy unless medically advised. Also with open wounds or skin conditions in flare. In doubt, and particularly when taking medication affecting blood pressure, it is worth asking beforehand rather than finding out inside the cabin.
Frequently asked
+What temperature is a sauna?
Between 80 and 100 degrees with 10 to 20 per cent humidity in a Finnish sauna.
+How long should I stay inside?
Eight to fifteen minutes per session, leaving earlier if any discomfort appears.
+How should the cooling be done?
Progressively over 1 to 3 minutes, starting at the feet and legs rather than the trunk.
+How does it differ from a steam room?
A steam room runs about 45 degrees with humidity near saturation, against dry sauna heat.
+When should I avoid it?
With uncontrolled cardiovascular disease, fever, acute infection or pregnancy without medical advice.
Sources
- 1Ministerio de Sanidad, Gobierno de España (August 2026)
- 2Govern de les Illes Balears, Govern de les Illes Balears (August 2026)