How Hot Is a Sauna? Temperatures for Dry, Steam and Infrared Saunas
Sauna Assistant App
Know what the room was like when it felt right
Connect an Apple Home sensor and Sauna Assistant saves the temperature and humidity with every round, so you can repeat the evening you liked.
Pay once. No subscription.
A traditional Finnish sauna is usually 80-100°C (176-212°F), measured near the ceiling above the top bench. Home saunas are often run a little cooler, around 70-90°C (158-194°F). A steam room is far cooler at 40-50°C (104-122°F) but close to 100% humidity, and an infrared sauna sits in between at 45-65°C (113-149°F).
The number on the thermometer is only half of it. How hot a sauna feels depends just as much on humidity and on which bench you sit on, which is why 70°C can feel harsh one evening and mild the next.
In This Guide
- Sauna temperatures by type
- Dry sauna temperature
- Steam room temperature
- Infrared sauna temperature
- The best sauna temperature for you
- Why the thermometer and your skin disagree
- Celsius to Fahrenheit for sauna temperatures
- Frequently asked questions
Sauna temperatures by type
| Type | Typical temperature | Typical humidity | How it feels |
|---|---|---|---|
| Finnish sauna | 80-100°C (176-212°F) | 10-20%, more after löyly | Dry heat that turns intense when water hits the stones |
| Home electric sauna | 70-90°C (158-194°F) | 10-20% | Same idea, often run a little cooler |
| Russian banya | 70-90°C (158-194°F) | Wetter, more steam | Heavy, humid heat, often with a whisk |
| Infrared sauna | 45-65°C (113-149°F) | Close to the room around it | Gentle air, warmth from the panels |
| Steam room | 40-50°C (104-122°F) | Close to 100% | Cool air, but sweat cannot evaporate |
These are typical ranges, not rules. Every room, heater and bench height is a little different.
Dry sauna temperature
A dry sauna is the Finnish kind with little water on the stones: usually 80-100°C (176-212°F) at 10-20% relative humidity. The low humidity is what makes those temperatures bearable. Your sweat evaporates quickly, and evaporation is how your body sheds heat.
Throw water on the stones (löyly) and the humidity jumps for a minute or two. The thermometer barely moves, but the room feels much hotter. Our sauna humidity guide has an interactive chart that shows how much hotter.
Steam room temperature
A steam room, Turkish bath or hammam runs at 40-50°C (104-122°F), less than half the temperature of a Finnish sauna. It still feels intense because the air is close to 100% humidity. Sweat cannot evaporate in saturated air, so it simply runs off you without cooling you down.
That is also why steam rooms are never run as hot as saunas. At close to 100% humidity, a few degrees more makes a big difference to how heavy the air feels.
Infrared sauna temperature
An infrared sauna is usually set to 45-65°C (113-149°F). Its panels warm your body directly rather than heating the air and stones, so the air itself is gentler than in a Finnish sauna. There are no stones to pour water on, and the humidity stays close to whatever the room around it holds.
Infrared sessions tend to run longer than Finnish rounds for the same reason: the heat builds more slowly.
The best sauna temperature for you
There is no single best temperature. A useful way to think about it:
- Your first sessions: around 70°C (158°F) or lower, on the lower bench, with short rounds. Our first-timer cheat sheet has a full routine for early sessions.
- Regular sauna-goers: most settle somewhere between 80 and 90°C (176-194°F) and use löyly to make a round more intense.
- Above 100°C (212°F): possible in some saunas, but hotter is not automatically better. If the air stings your nose or ears, the room is too hot for you that evening.
Go by how the room feels rather than chasing a number, and step out whenever you want to. How long to stay matters as much as how hot it is: our guide to timing sauna rounds covers round lengths and breaks.
This guide is general information, not medical advice. If you are pregnant, have a heart condition or take medication that affects blood pressure, ask your doctor before using a sauna.
Why the thermometer and your skin disagree
Three things change how hot the same sauna feels:
Bench height. Heat rises. The top bench can be 20-30°C warmer than the floor, so the same room feels very different depending on where you sit. Sauna thermometers are usually mounted high, near the ceiling, so they show close to the hottest air in the room.
Humidity. At the same temperature, wetter air feels hotter, because sweat evaporates more slowly. See the humidity guide for the numbers.
Airflow. A sauna with good ventilation feels fresher at the same temperature than a stuffy one, even if the thermometer agrees.
If your readings seem off, check the instrument. Cheap dial thermometers and hygrometers drift, and our hygrometer calibration guide shows a simple way to check one.
Remembering the temperature that felt right
The evening that felt perfect is easy to forget by next week. Sauna Assistant saves the temperature and humidity of every round when you connect an Apple Home sensor, so you can see what the room was actually like and set it up the same way again. With a supported heater, it can also tell you when the sauna has reached your temperature.
Celsius to Fahrenheit for sauna temperatures
| Celsius | Fahrenheit |
|---|---|
| 40°C | 104°F |
| 50°C | 122°F |
| 60°C | 140°F |
| 70°C | 158°F |
| 80°C | 176°F |
| 90°C | 194°F |
| 100°C | 212°F |
| 110°C | 230°F |
Frequently asked questions
How hot is a sauna?
A traditional Finnish sauna is usually 80-100°C (176-212°F) near the ceiling above the top bench. Home saunas are often run a little cooler, around 70-90°C. Infrared saunas are 45-65°C and steam rooms 40-50°C.
What is the best temperature for a sauna?
There is no single best temperature. Start around 70°C (158°F) or lower on the lower bench. Most regular sauna-goers settle between 80 and 90°C (176-194°F) and add water to the stones when they want more intensity.
How hot is a dry sauna?
A dry Finnish sauna usually runs at 80-100°C (176-212°F) with 10-20% relative humidity. The dry air lets sweat evaporate, which is what makes those temperatures bearable.
What temperature is a steam room?
A steam room usually runs at 40-50°C (104-122°F) with humidity close to 100%. It feels intense at a much lower temperature than a sauna because sweat cannot evaporate in saturated air.
How hot is an infrared sauna?
Infrared saunas are usually set to 45-65°C (113-149°F). The panels warm your body directly, so the air is gentler than in a Finnish sauna and sessions often run longer.
How hot is a sauna in Celsius?
A Finnish sauna is usually 80-100°C, a home sauna often 70-90°C, an infrared sauna 45-65°C and a steam room 40-50°C.
Is 100°C too hot for a sauna?
Not for experienced sauna-goers in a dry Finnish sauna, where 100°C (212°F) is at the top of the normal range. It is too hot for a first session. Start lower, and leave whenever the heat stops feeling good.
