The Apple Watch 8 will need this feature to be best smartwatch

Apple Watch 7
(Image credit: TechRadar)

It seems like smartwatch evolution moves at a turtle’s pace, and new features are added only once every few generations. This year, we’re hoping that the best new smartwatches, especially the Apple Watch 8 that Apple is expected to announce on September 7, will include a skin temperature sensor. 

Rumors have gone back and forth about whether or not the upcoming watch will have the health-focused feature. Here’s why we think temperature sensing matters, and why the feature has stalled

There are many useful applications for a health monitoring app to use a history of your skin temperature. The most basic, and least problematic, would be for sleep monitoring. Your temperature is supposed to go up as you sleep and your body releases heat. If your watch can include temperature with sleep monitoring, you’ll have a better idea of why you did or did not get a good night's sleep. It could be that you were too hot or too cold.

Image of man sleeping while using a fitness/sleep tracker

(Image credit: Getty Images)

This is actually a surprisingly useful metric that most smartwatches can’t measure. Fitbit has done an excellent job including temperature sensing in its devices, and, of course, its newest Fitbit Sense 2 watch includes not only temperature but also electrodermal monitoring (EDA) to detect changes in stress and emotional response on the skin. The more information a device can gather, the more robust a portrait of your health it can paint.

Just for sleep?

There may be other reasons to track skin temperature, but here we get into health and wellness claims that are hard to support with a consumer-grade device like a smartwatch. For instance, it’s possible that changes in skin temperature could be signs of an illness, but Apple would need to clear towering regulatory hurdles to win approval for an Apple Watch that can make a medical recommendation.

In these pandemic times, we’re all familiar with spot temperature checks. Can a smartwatch stand in for a thermometer gun aimed at your head? Probably not, at least that’s not a feature manufacturers are claiming. Skin temperature sensors won’t be able to set off alarms telling you that you have a fever or need to rush to an emergency room.

Analysis: This is the best new thing on the horizon

This generation of smartwatches, including the Samsung Galaxy Watch 5 and Fitbit Versa 4,  is gaining improvements with fitness tracking and with sleep monitoring. More sensors help watches accomplish both of these tasks, while larger batteries and faster charging help with longevity and tracking through a night’s sleep. Otherwise, there is not a revolutionary new technology to feature.

For almost every major smartwatch brand, the internal chipset hardware for running apps and connecting to networks has remained mostly unchanged since last year’s model. Samsung’s Galaxy Watch 5 is internally identical to the Galaxy Watch 4. The Apple Watch 7 was the same inside as the Apple Watch 6, and the upcoming Watch 8 may not be much different. Therefore, innovation in sensors, and the way sensor data is interpreted, is going to be a key improvement this year for smartwatches. 

There is a race to implement skin temperature, and Apple could win if it hurries. Samsung launched the Galaxy Watch 5 with skin temperature capabilities, but the feature is not active and Samsung won’t say when it’s coming. Other manufacturers have worked it out, but the two titan competitors at the top of the market, Apple and Samsung, are now running  to see who will be first to measure our temperature from our wrist

Philip Berne
US Mobiles Editor

Phil Berne is a preeminent voice in consumer electronics reviews, having reviewed his first device (the Sony D-EJ01 Discman) more than 20 years ago for He has been writing about phones and mobile technology, since before the iPhone, for a variety of sites including PCMag, infoSync, PhoneScoop, and Slashgear. He holds an M.A. in Cultural Theory from Carnegie Mellon University. 

Phil was the internal reviewer for Samsung Mobile, writing opinions and review predictions about top secret new devices months before launch. He left in 2017. He worked at an Apple Store near Boston, MA, at the height of iPod popularity. He has been a High School English teacher at Title I schools, and is a certified Lifeguard. His passion is smartphones and wearables, and he is sure that the next big thing will be phones we wear on our faces.