Track your nightly wrist temperature with Apple Watch Ultra

Wear Apple Watch Ultra to bed to track nightly changes in your wrist temperature, which can provide insight into your well-being. In addition, Cycle Tracking can use wrist temperature data to improve period predictions and provide retrospective ovulation estimates.

To establish your temperature baseline, wear your Apple Watch Ultra to bed with Sleep Tracking turned on.

Important: The temperature sensing feature is not a medical device, and is not intended for use in medical diagnosis, treatment, or for any other medical purpose.

Set up wrist temperature tracking

Set up Sleep with Track Sleep with Apple Watch turned on.
To establish a temperature baseline, ensure the Sleep Focus is on, then wear your Apple Watch Ultra while sleeping.
Wrist temperature data will be available after about five nights.

Note: Your body temperature naturally fluctuates, and can vary from night to night due to a number of variables. Wrist temperature can also be impacted by external factors like your sleep environment.

Review your wrist temperature

Open the Health app on your iPhone, then tap Browse.
Tap Body Measurements, then tap Wrist Temperature.
To show sample details, tap a point on the chart.

Turn off wrist temperature tracking

Open the Apple Watch app on your iPhone.
Tap My Watch, tap Privacy, then turn off Wrist Temperature.

Helpful?

Apple Watch Ultra User Guide

Track your nightly wrist temperature with Apple Watch Ultra

Set up wrist temperature tracking

Review your wrist temperature

Turn off wrist temperature tracking