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How wrist temperature measurement works

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Many customers today get their Apple Watch Ultra – or the Apple Watch Series 8. Smartwatches have new tricks up their sleeve, for example night-time temperature changes can be measured on the wrist. Wrist temperature is a metric related to body temperature measured by your Apple Watch while you sleep. Your body temperature fluctuates naturally and can vary each night due to your diet and exercise, alcohol consumption, sleep environment, or physiological factors such as menstrual cycles and illness.

  • The temperature sensing feature is not a medical device and is not intended for use in medical diagnosis, treatment, or any other medical purpose.
  • The temperature detection function is not a thermometer and cannot take wrist temperature measurements if necessary.
  • The temperature detection feature is designed for users 14 years of age or older.
  • Wrist temperature data can also be affected by certain physiological, lifestyle, and environmental factors.

After about 5 nights, your Apple Watch will determine the baseline temperature on your wrist and look for nightly changes. You can then see it in the Health app, keyword “Wrist temperature”. In the meantime, Apple has also released a support document for this, which again explains how temperature is measured. Apple Watch Series 8 and Apple Watch Ultra have 2 temperature sensors – one on the back glass next to your skin and another just below the screen. While users sleep, the Apple Watch measures temperature every five seconds. If you don’t want this, you can disable the feature (Watch app on iPhone > Settings > Privacy & Security > Health > Wrist Temperature).

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