Yes. The current Google Play description says the Body Temperature - Thermometer companion phone app can start a measurement on your watch. The watch's own sensor supplies the wrist skin-temperature reading; the phone does not become a thermometer.
The same listing describes the watch app as fully standalone. Starting a watch measurement from the phone is an additional control, not a requirement to have the phone open for every reading.
What does the phone control do?
Google Play lists “Start a measurement on your watch from your phone” among companion app features. Its official artwork shows a Take Temperature control on the phone beside a watch measurement screen. The listing does not publish a universal pairing procedure, timing guarantee or exact sequence for every version, so follow the controls in the installed apps.
Can the watch still measure without the phone?
Yes. Google Play calls the watch app fully standalone and says the reading comes directly from its skin-temperature sensor. The phone companion app also provides history, charts, a daily summary and a home screen widget. The listing says watch and phone communicate over Bluetooth; it does not claim that a remote start works at an unlimited distance.
Which watches can supply a reading?
The current compatibility list names Galaxy Watch 5, 5 Pro, 6, 6 Classic, 6 Classic Astro Edition, 7, 8, 8 Classic, 9, Ultra, Ultra (2025) and Ultra 2. Galaxy Watch FE lacks the required skin-temperature sensor, and the listing excludes non-Samsung Wear OS watches. Check the current Google Play device eligibility for your own watch.
Is a phone-started result a medical temperature?
No. Starting a measurement from the phone does not change the sensor or what it measures. The result is wrist skin temperature, not core or oral body temperature. The app is not a medical device and must not be used to diagnose, treat, cure, prevent or confirm fever or another medical condition. See the current Body Temperature - Thermometer listing on Google Play for features and compatibility.
Frequently asked questions
Can the phone app start a watch measurement?
Yes. The current Google Play description lists a companion phone control to start a measurement on the watch.
Does the phone sensor take the reading?
No. The reading comes from the supported Galaxy Watch's skin-temperature sensor.
Must I open the phone app for every measurement?
No. Google Play also describes the watch app as fully standalone.
Does remote start work with every Wear OS watch?
No. The listing limits support to named Samsung Galaxy Watch models and excludes Galaxy Watch FE and non-Samsung Wear OS watches.
Can this reading confirm a fever?
No. It is a wrist skin-temperature reading from a non-medical app, not a fever diagnosis or confirmation.