How to change from Celsius to Fahrenheit on my Apple watch face

Hi

To change to Fahrenheit on your Apple Watch:

On your iPhone, in the Weather app, tap on °C / °F to switch between units.

The change will be reflected automatically in the Weather app (and its watch face complications) on your Apple Watch.

The temperature unit cannot be changed directly on your Apple Watch.

Well, you can easily change the temperature on your IPhone. But I need to change in on my Apple Watch 3, without referring to the iPhone. . Any ideas? Thanks