Best Pool Thermometer

Pool Thermometer Guide

Although your backyard pool might look appealing with its crystal clear blue water, it is not always safe or advisable to do so. When you have young ones around or at-risk groups looking to share the pool, it is important to make sure it is warm enough to do so.

Even a swimmer looking for a cooler temperature so they can swim lengths will need to be sure the temperature is not too low. This is why it is a good idea to invest in a quality pool thermometer. We have created the following buyer’s guide to help you find a good one.

What To Look For In A Pool Thermometer

Clear Display

The easier it is to take a reading the better. Most products have nailed this, especially the digital pool thermometer types. Make sure it has a well-lit backlight and that it is still clear even under bright conditions.

Floating or Hanging 

These are the two main choices you have and a hanging pool thermometer tends to be placed on the ladder or to the side of the pool, submerged under the surface. This is where you will need to keep an eye on the water levels as they will evaporate faster in the warmer months and the hanging thermometer needs to be underwater to work. 

Floating pool thermometers use inner sensors as they bob on the water but sometimes are not as accurate. because they aren’t fully submerged.

Battery Life

A digital pool thermometer is only as good as the battery life. You might consider a solar-powered product for this reason and otherwise, analog pool thermometers do not have this problem. 


You need to buy a product that is made from quality materials, particularly the casing of the thermometer. When it comes to water and the hard surfaces around the pool, accidents happen so try and find a thermometer that is known for being able to withstand a few bumps and grazes. 

Since these products are designed to go in the water with chemicals such as chlorine, they also need adequate protection. Because they are exposed to this, and the UV rays when outside, it is important to make sure the product you like it known for its durability.


Above all else, you need to be able to take reliable readings. Most products are accurate within a fraction of a degree and although you can afford a little room for error, you don’t want to be using a product that can’t give you an accurate temperature check.


Thanks to modern technology, you can purchase a pool thermometer that will alert you when the water is below or above a set temperature range. This is useful for anyone who has a heated pool and needs it to reach a certain level before they consider getting in.


Not everyone works in both Fahrenheit and Celcius so it is important to make sure you have the one you use most often. A lot of products will provide both which makes life that bit easier.


Not every product is going to come with a warranty but it can be a good idea to protect your purchase, especially if you are investing in a high-end pool thermometer. Some brands will give you a couple of years but anything of a year and above can give you a bit of reassurance.

Why Buy A Pool Thermometer?

There are different reasons for checking the water temperature depending on who is using the pool. If the water is too cold, you could end up going into shock. Anything below 60 degrees F is going to feel too frigid for many people to even consider. 

It could lead to restricted blood flow which in turn might result in hypothermia. This is why it is important to check the water is warm enough use. Another consideration is whether or not the water is too warm.

Yes, many people use hot tubs which means that hot water should be fine no matter what right? Wrong! There is a reason why you’re only supposed to use a hot tub for certain periods. Also, when you’re in a hot tub, you are sitting and relaxing, swimming is another story as it can lead to dehydration.

Temperatures over 90 degrees F will mean you are sweating more profusely which can dehydrate the swimmer and cause cramps.

Pool Thermometers and Algae

Because certain temperatures are ideal for bacteria and algae to fester and grow, you need to keep a check on the temperature. Anything of 90 degrees and above might become a feeding ground for unwanted germs.

This is where the temperature of the water is not favorable for chlorine and it can break down sooner than it would usually. As a result, the water is at the mercy of these building up so you will want to know when you will need to keep an eye on the chemical levels more frequently.

What Is The Ideal Temperature For A Swimming Pool?

When using a pool thermometer, it is good to know what should be considered the optimal range for swimming. This varies depending on who is using the pool as children will need a more comfortable temperature so something at the colder end will not suffice.

For most people, the ideal temperature is between 83 and 88 degrees F which is often ideal for beginner swimmers as well. 

Different Types of Pool Thermometers

There isn’t a tonne of variety, but the two most common differ greatly.


These are more basic yet affordable and still popular with many people. An analog pool thermometer will also last a long time and you will be unlucky if you pick up a product that is not highly durable.

The only way they can start to be less effective is if the mercury used to provide the readings starts to deteriorate because of sun exposure.


These come with clear, easy to read displays that resemble most modern technology. They are not as affordable as the analog options but some come with access to a complementing smartphone app to allow you to make clear readings and adjustments.

Most importantly, they. are accurate and most of the time, easy to use.

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