Not sure what to set your hot tub to? This guide explains the best temperature for comfort, safety, season and everyday use, with simple settings you can use at home.
For most adults, the best hot tub temperature is usually between 37°C and 39°C. This range feels properly warm, is comfortable for a typical soak, and suits most day to day use.
If you like shorter, hotter soaks, you may prefer 40°C, which is generally the maximum setting on many hot tubs. If you want a longer, more relaxed soak, 36°C to 37°C can feel more comfortable, especially in milder weather.
The best setting changes depending on who is getting in and why you are using the spa. A quiet evening soak may call for a different temperature than a quick dip after exercise or a family session.
If children are using the hot tub, lower temperatures are a safer choice and sessions should be kept short. If anyone feels too hot, light headed or uncomfortable, get out, cool down and reduce the setting before the next use.
A hot tub should feel relaxing, not overwhelming. If the water feels too hot after a few minutes, the setting is probably higher than you need. Many owners find that a small adjustment of 1°C makes a noticeable difference.
Comfort also depends on wind, air temperature and how long the cover has been off. In winter, the same temperature can feel cooler when you first get in, while in summer it may feel much hotter than expected.
Season makes a big difference. In summer, many people prefer a lower setting so the spa still feels refreshing. In winter, a slightly higher temperature can help the water feel cosy as soon as you step in.
If you use your hot tub most evenings, keeping a steady temperature often works better than making large changes every day. If you only use it occasionally, a lower standby temperature may make more sense, as long as you allow enough time for reheating before use.
Once you find the best temperature, good hot tub care helps keep the water comfortable and ready to use. Heat loss, poor circulation and water balance issues can all affect how the tub performs.
If your water never seems to feel right, it is worth checking both the displayed temperature and the actual feel of the water over a short soak. A simple routine of testing, cleaning and sensible temperature control usually gives the most comfortable result.
40°C is very warm and is usually the top setting on many hot tubs. It can suit short soaks for some adults, but many people find 37°C to 39°C more comfortable.
Children should use cooler water than adults, with close supervision and short sessions. If in doubt, choose a lower setting and avoid water that feels very hot.
A lower set temperature uses less heating than a higher one. The cheapest practical setting depends on how often you use the tub and how quickly you want it ready.
Yes, many owners lower the temperature in warm weather. A setting around 35°C to 37°C often feels more comfortable in summer than a full winter heat setting.
Expert guides on hot tub and pool water care, sanitisation, balancing, troubleshooting and seasonal maintenance from the ClearSpa team.