Not sure what temperature to set your hot tub to? Here is the average hot tub temp for daily use, with simple guidance for comfort, safety and seasonal changes.
The average hot tub temp for everyday adult use is usually around 37 C to 38 C. For many people, that feels warm, comfortable and relaxing without being too intense for a normal soak.
Some owners prefer 36 C for a gentler soak, while others like 39 C for a hotter feel. A setting of 40 C is generally considered the top end for most domestic hot tubs, so it is not usually the best everyday default.
The best temperature depends on how long you plan to stay in the water, the weather outside and who is using the tub. If you want a regular setting you can leave in place most of the time, 37 C or 38 C is a sensible starting point.
If the water feels too hot after a few minutes, reduce it by 1 degree and try again the next time. Small changes make a noticeable difference.
UK weather can make the same hot tub setting feel very different across the year. In winter, a temperature that feels perfect in summer may seem a little cool when the air is cold.
Rather than making big changes, increase or decrease the temperature gradually to keep the water comfortable without overdoing it.
For healthy adults, 37 C to 38 C is a common comfort zone. Higher temperatures can feel relaxing, but they can also become uncomfortable more quickly, especially during longer soaks.
Children usually need lower temperatures and shorter sessions. If children use the hot tub, keep the water more moderate and supervise them closely at all times.
Many owners keep their hot tub at a steady everyday temperature, then make small adjustments when needed. This is convenient and means the spa is ready to use more often.
If you only use your hot tub occasionally, you may prefer to lower the temperature between uses and heat it back up before you get in. The best approach depends on your routine, the time of year and how quickly your spa reheats.
For many people, 40 C is the upper end rather than the best average setting. It may be suitable for some adults for short soaks, but 37 C to 38 C is usually a better everyday temperature.
In summer, many people prefer a lower setting such as 35 C to 37 C. Warm weather can make higher temperatures feel much hotter than usual.
In winter, adults often prefer 38 C to 39 C because the cold air makes the water feel cooler. Start lower and increase gradually until it feels comfortable.
Children should use cooler water than adults and stay in for shorter periods. Keep the temperature moderate and supervise them closely throughout the soak.
Expert guides on hot tub and pool water care, sanitisation, balancing, troubleshooting and seasonal maintenance from the ClearSpa team.