Apple Watch Ultra wrist temperature not working

Hello Xjenner,

You can find more details on that feature, including the requirements, below:

Your wrist temperature is a measurement related to your body's temperature taken by your Apple Watch while you're asleep. 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.

If you use Cycle Tracking, your wrist temperature can also be used to provide retrospective ovulation estimates and improve period predictions.

Here's what you need

• An Apple Watch Series 8 or Apple Watch Ultra.

• Sleep must be set up with Track Sleep with Apple Watch enabled.

• Sleep Focus must be enabled for at least 4 hours a night for about 5 nights.

You can also find those steps in this resource: Track your nightly wrist temperature changes with Apple Watch - Apple Support

If you need additional help with that feature, you'll want to reach out to Apple Support: Contact - Official Apple Support They'll be in the best position to assist further.

Take care.