@SamuraiKat you can change it in the app.
Amanda | Wyoming, USA
Pixel Watch 4, Inspire 3, Sense | Android
I found the units in App Settings, which is below the red lettered Shop Fitbit line of the Account page on my phone’s app. And lo and behold, all the units on the phone’s app were already set to US units, such as F, not C. Then I sync’d the watch and phone, which seemed to go as usual, and got the message that I was up to date. So what did I find when I then checked the weather? You got it; Celsius. Is is April Fool’s Day?