Wrist temperature

Nightly skin temperature as a change from your usual, not a body temperature.

Apple Watch (Series 8 and later, and Ultra) measures your wrist temperature while you sleep. Oura and some other rings measure finger temperature.

How to read it

The reading is a change from your own usual, in degrees above or below. It isn't your body temperature, and it can't tell you whether you have a fever.

It shifts with your cycle, alcohol, a warm room, a late meal or a coming cold. A rise for a night or two is worth noticing alongside your resting heart rate and HRV.

It shows in Longevity > Body, under Biomarkers.

Didn't find what you need? Email quentin@somalabs.me with a screenshot, or search all of Help.