No, that’s not what it’s for.
Exactly.
You’ll note that there’s no option to take a temperature reading right this moment, in contrast to the way you can get heart rate, blood oxygen, and EEG readings on demand.
The primary intention for temperature is reproductive cycle tracking, at which it appears to be quite effective.
Secondarily to that, you’ll be able to tell when you have a fever overnight … but that’s not likely to be all that useful nor surprising. You’ll feel sick enough to reach for a traditional thermometer.
About the only diagnostic I can think of (beyond, of course, cycle tracking) that might be useful is long-term changes in temperature which might indicate something serious, like thyroid disfunction. But Apple hasn’t mentioned that sort of thing, so there might be a technical limitation.
Incidentally, I’d love the ability to get an on-demand temperature reading. But, again, this hardware isn’t able to provide that.
b&
