Choosing the correct temperature for your hot tub is a big part of enjoying it, but also staying safe. The optimum temperature varies throughout the seasons, so here is a guide for you to save and refer to.
| Season | Degree Celsius | Fahrenheit |
| Autumn | 36-38 | 96 – 100 |
| Winter | 36-40 | 96 – 104 |
| Spring | 36-38 | 96 – 100 |
| Summer | 25-37 | 77 – 98 |
Of course, personal preference will play a part in this, and it is up to you what temperature you set your hot tub. Keep in mind that 40 degrees is the highest temperature a hot tub should reach in line with BISHTA guidelines and anything above this is dangerous.
Autumn
Ideal temperature: Between 36-38 degrees Celsius or 96-100 degrees Fahrenheit
Personal preference can be exercised here, throughout the autumn months to get your hot tub feeling like the right kind of temperature. Whether you like it on the hot side or are craving some cooler bubbles, your hot tub will have the function and necessary means to change this up.
Winter
Ideal temperature: Between 36-40 degrees Celsius or 96-104 degrees Fahrenheit
You might want to up the water temperature in the winter, especially with outdoor hot tubs. UK winters can be chilly and have an edge to them, so slightly warmer temperatures will make sure you can enjoy the outdoor setting, while still staying toasty.
Spring
Ideal temperature: Between 36-38 degrees Celsius or 96-100 degrees Fahrenheit
As with Autumn, preference comes into play and you can take it up or down a notch depending on how you’re feeling weather-wise and health-wise.
Summer
Ideal temperature: Between 25-37 degrees Celsius or 77-98 degrees Fahrenheit
You need to cool off the temperature in the summer months to prevent overheating, but also because hot tubs can be a social place to cool down when the heat gets too much. Although the weather isn’t the hottest in the UK, it is important to keep this in mind and prepare accordingly. Some hot tub owners even prefer to take the temperature down and use the tub to cool off on hotter days, going as low as 26 degrees Celsius for that cool water feeling.
Hot tub temperature safety
The worry and concern is around getting too hot too quickly, so looking at the temperature variation in the summer versus the winter is key.
If you don’t adhere to the relevant guidelines, you can end up feeling unwell, and even at risk of the following –
- Dehydration
- Heat exhaustion
- Heat stroke
- Heat rash
- Heat cramps
If you have any health complaints or concerns, please consult a doctor before indulging in the hot tub.
Are hot tubs safe for pregnant women?
Pregnant women should not spend time in water above 35 degrees, so consider this if you’re pregnant and considering using a hot tub. There may be the option to cool the water temperature down but there is little research that has been conducted on the safety of this, and whether or not it can be harmful. If you are pregnant and considering using a hot tub, you can read the NHS website for guidance and information, but the general consensus is that it is best to avoid usage.
What is the optimal temperature for children?
Hot tubs are not suited for children under the age of five. Children under the age of 18 will require a cooler temperature. Anywhere between 25 – 30 will be a good guide for young people, and make sure they are supervised at all times.
Should you leave your hot tub on all the time?
Unless you’re not going to be using your hot tub for a month or longer, it is more cost and energy efficient to keep your hot tub filled and on, ready for use. They’re designed to be always on, which makes them perfect for an impromptu dip!
How can you control the temperature of your hot tub?
Your hot tub will have settings to determine the temperature, with most modern models not allowing the temperature to exceed 40 degrees. Get familiar with your hot tubs technology and make sure that you are able to operate and change the temperature of your hot tub.
