Users of the Apple Watch Series 8 and Apple Watch Ultra will need to wear their watch for five nights before it can detect a baseline temperature according to a new support document published by Apple.
The Apple Watch Series 8 and Apple Watch Ultra have a temperature sensor under the display and on the back crystal. Every five seconds, Apple Watches sample the wearer's wrist temperature. According to Apple, this design reduces bias from the outside environment.
Your body temperature naturally fluctuates and can vary each night due to your diet and exercise, alcohol consumption, sleep environment, or physiological factors such as menstrual cycles and illness. After about 5 nights, your Apple Watch will determine your baseline wrist temperature and look for nightly changes to it.
"Track Sleep with Apple Watch" must be enabled to allow for at least four hours of sleep a night. Users can check Body Measurement in the Health app.
The feature isn't a medical-grade device and shouldn't be used for any medical purpose, nor is it a thermometer, and it can't provide measurements on demand. Wrist temperature data can be impacted by a loose-fitting Apple watch.
Apple is marketing the feature in promotional materials for the new Apple Watch models as a way to improve period predictions and retrospective ovulation estimates, but the support document suggests that tracking nightly temperature changes while sleeping can give anyone insight into their overall well-being.
Wrist temperature can be turned off in the watch app for those who don't use it.
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