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The Complete Guide to Hot Tub Temperature

What you should know about Hot Tub Temperature

The hot tub temperature is absolutely everything. Obviously, the whole purpose of a hot tub is to have hot water. However, the key is to not have it too hot. If you do, then it becomes quite uncomfortable and can cause some serious health issues.

On this page, we are going to look at the hot tub temperature that you should be aiming for. We are also going to provide you with a bit of information on ensuring that your hot tub maintains that temperature. This can save you a little bit of money on your energy bills each month!

What Hot Tub Temperature is Right For You?

Generally speaking, most people are going to want to have their hot tub around the 100F to 102F mark. This is a ‘comfortable’ level, which still provides a little bit of warmth. For safety reasons, nearly every modern hot tub that you purchase will not allow you to go above 104F. However, it is unlikely you will want to be sitting in water anywhere near this temperature. If you do, it isn’t going to be relaxing, it is going to be dreadfully uncomfortable. So, for that reason, you need to stick to the 100F to 102F mark. There are a few exceptions to this rule.

If you have children in the hot tub, then you should not be going beyond 98F. Anything beyond this, then it is going to be too hot for your children. In fact, in normal circumstances, you probably shouldn’t have any children in the hot tub at all. The same goes for the elderly. Their bodies are unable to cope quite so much when it comes to being in heat beyond normal body temperature. 

Remember; if you are pregnant, there is no temperature that is ‘right’ for you. Even at a low hot tub temperature, you run the risk of doing harm to your unborn child.

It is up to you to find the temperature that you are most comfortable at. As we said; it is likely to be somewhere around the 100F to 102F mark. If you must sit at the maximum temperature for your hot tub (which is probably going to be 104F), then you should not in it for an extended period of time. It could be deadly.

Invest in a Quality Hot Tub Thermometer

Your hot tub will have some sort of way to monitor the temperature built into it. However, the built-in thermometers are not always going to be that accurate. Therefore, we suggest that you purchase a quality hot tub thermometer. You should not try to gauge the temperature without one. After all, there is barely any difference in degrees between being nice and cozy and overheating.

You should be checking the temperature before you get into the hot tub. You can then make the relevant adjustments. If you find that the in-built hot tub thermometer is drastically out all the time, then you may want to look into getting your hot tub repaired. This ensures that the proper hot tub temperature is always maintained.

The Importance of Ensuring that the Hot Tub Temperature is Not Too High

The maximum ‘normal’ body temperature sits somewhere between 97.7F to 99.5F. When you get into the hot tub, you will be raising the temperature of your body. It feels good, but it is dangerous if you raise it too much. Your body is going to overheat. This can lead to:

  • Heatstroke
  • Nausea
  • Fainting
  • Headaches
  • General discomfort

It doesn’t take much to send you over the edge either. Raising your temperature by just a couple of degrees F can lead to these problems occurring. This is why we have suggested that you sit at the 100F mark and only go up if you need to. You should never be spending extended times in the hot tub.

The Importance of Chemicals at a High Hot Tub Temperature

As you are about to discover; it is actually better to leave your hot tub at the temperature that you use it at, as opposed to constantly turning it on and off. Of course, as you probably know; bacteria is going to thrive at higher temperatures. In fact, the average temperature of a hot tub is ripe for bacteria to thrive.

This means that when you are keeping your hot tub temperature nice and high, you also need to ensure that you are regularly checking the chemical levels in your hot tub. If you do not, then the number of bacteria in the hot tub will start to get out of hand. This means that you will eventually need to shock or drain the pool…which is just expensive.

If you are using your hot tub daily, then we suggest that you check the bacteria and chemical levels at least once every couple of days. You may need to do it more regularly than this if you are using the hot tub multiple times per day.

Set The Temperature Higher When It is Cold

On an average day, you are not going to be able to handle your hot tub being switched up to 104F. However, during the winter months, this may be the exact hot tub temperature you want to be relaxing in.

If your hot tub is outdoors on a cold day, then there will be a bit of wind and a chill. This means that sitting outside is going to be rather cold. As a result, you may want to turn up the hot tub temperature a couple of degrees higher than the number that you normally sit in. Not too much. Just one or two degrees. This will be a much more comfortable temperature for you.

Likewise, on the hotter summer days, you may actually want to turn the hot tub temperature a little bit lower than what you are used to. If you don’t, then you may end up suffering from heatstroke…which is not a pleasant experience. During the summer months, because it is so hot outside, you probably shouldn’t be spending too long in your hot tub anyway. Most people will be able to stomach 15 to 20 minutes.

Do Not Constantly Change the Temperature

Once you have found a hot tub temperature that you like, then leave it at that. We know that there are a few people who will adjust the hot tub temperature almost constantly. They may even leave the hot tub turned all the way down when they get out of it. Do not do that.

You see, hot tubs are not really designed to have their temperature changed constantly. They are designed to be sat at the same temperature almost constantly. Obviously, they will be maintaining their temperature, but there will only be a small variation here and they are generally capable of that.

If you are turning the hot tub temperature down several degrees (think 10F+) and then back up again when you get back into the hot tub, you are going to ruin the heating element in your hot tub. It will wear it down having to constantly readjust massive temperature differences like this. Not to mention the higher power bills that you will need to deal with.

That being said, if you are not planning to use your hot tub for weeks on end, it is fine to turn it down considerably. We wouldn’t recommend that you turn it off (more on this soon), but you can leave it at around 50F and be fine.

How to Maintain the Hot Tub Temperature To Save Money on Energy Bills

Let’s take a look at how the temperature of your hot tub will impact your energy bills.

As we mentioned previously; constant readjustment of the temperature is not good. This is because every time the hot tub temperature falls, the hot tub needs to expend energy to heat it back up again. This means that if you are turning your hot tub off when you are not using it, the hot tub now needs to spend a lot of energy heating the tub back up again. It can easily cost $3 per day doing this. However, if you let the hot tub maintain the temperature, then you would be spending somewhere in the region of $2.

In order to maintain your hot tub temperature, you will also want to ensure that the hot tub is covered by a quality cover when you are done using it. This will ‘lock’ the heat in. This ensures that the temperature will not plummet too quickly and, as a result, the hot tub will need to spend a lot less effort in maintaining it.


As you can see; there are several reasons why you need to ensure that you maintain a proper hot tub temperature. It will ensure your comfort, while at the same time ensuring that you save money on your energy bills. If you are not sure what the ‘right’ temperature is for you in a hot tub, start with 100F and work your way up from there. Chances are that you will be more comfortable at a lower temperature than you previously thought.

Posted in pool maintenance

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