How can I change my Apple gen 1 Watch from Celsius to Fahrenheit?
How can I change my Apple gen 1 Watch from Celsius to Fahrenheit?
On your iPhone Settings (not the Watch App) Settings->General->Language & Region->Temperature->Tap C
It will take a moment or two to change.
But you have a series 1 Watch that is long since obsolete and no longer supported. I can’t guarantee this will work for you.