Apple today published a file Supporting Documents With additional details about the new wrist temperature sensing feature available on the Apple Watch Series 8 and Apple Watch Ultra models, it turns out that the feature requires users to wear their watch for five nights before they can detect a core temperature.

Apple Watch Series 8 Triple
The Apple Watch Series 8‌ and Apple Watch Ultra‌ have two temperature sensors — one on the back of the crystal near your skin and the other just below the screen. While the wearer sleeps, the Apple Watch samples wrist temperature every five seconds. This design improves accuracy by reducing bias from the external environment, according to Apple.

Your body temperature naturally fluctuates and can vary each night due to your diet, exercise, alcohol consumption, sleep environment, or physiological factors such as the menstrual cycle and illness. After about 5 nights, your Apple Watch will determine your wrist’s basal temperature and look for changes to it at night.

Apple says Sleep should be set up with “Track Sleep with Apple Watch” enabled, and Sleep Focus should be enabled for at least four hours per night for about five nights. Then, users can check their body measurements -> wrist temperature in the Health app for the recorded measurements.

Apple cautions that the feature is not a medical device and should not be used for any medical purpose, nor is it a thermometer, and it cannot provide on-demand measurements. An ill-fitting Apple Watch can also affect wrist temperature data.

Apple is marketing the feature in promotional materials for new Apple Watch models as a way to improve period forecast And the Retrospective ovulation estimatesbut the support document notes that tracking changes in nighttime temperature during sleep can give anyone insight into “general well-being”.

For those who do not have use of this feature, wrist temperature can be turned off in the Watch app on the iPhone, under Privacy -> Wrist temperature is turned off.

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