Sauna temperature and time
Sauna heat stresses the cardiovascular system. If you're pregnant, have heart disease, low blood pressure, or any medical condition, talk to your doctor before sauna use. Never sauna after drinking alcohol.
"How long should I stay in the sauna?" can't be answered without "how hot is it?" Heat and time trade off against each other — a short session in a very hot room and a longer session in a milder one can be similar loads on your body. Thinking in terms of a combined dose is more useful than either number alone.
Typical ranges
Traditional Finnish saunas, the kind used in most of the long-term research, run hot and dry:
| Variable | Common range |
|---|---|
| Temperature | 150–195°F (65–90°C) |
| Session length | 5–20 min |
| Research-cohort average | ~79°C, ~14 min |
Infrared saunas run much cooler (typically 110–140°F) and rely on longer sessions, so don't map an infrared time onto a traditional temperature or vice versa.
Heat and time combine into a dose
Your body's heat load grows with both temperature and how long you sit in it. A reasonable beginner dose is a single 8–12 minute round at a moderate temperature; experienced users often do multiple rounds with cool-downs between. The right total is the one that leaves you pleasantly heated, not dizzy, nauseated, or faint.
Listen to your body over the clock. Lightheadedness, a pounding heart, or nausea are signals to leave — regardless of how many minutes are left. Cool down and rehydrate between rounds rather than pushing a single long session.
Safety basics
- Hydrate before and after — you lose meaningful fluid through sweat.
- Build up gradually — start shorter and cooler and increase over weeks.
- No alcohol, and step out if you feel unwell.
- Cool down between rounds rather than chaining long sessions back-to-back.
Steam turns heat and time into a session plan
Set your sauna's temperature and your experience level and Steam suggests a session length and round structure, tracking your weekly pattern — informational, with the research assumptions shown. Free to download.
Sources
- Laukkanen et al., long-term Finnish sauna cohort studies (typical temperature/duration use)
- General sauna-safety guidance (hydration, gradual exposure, contraindications)
Ranges describe common practice, not a prescription. Consult a clinician about your own situation.