Your Apple devices provide a global setting for representing specific quantities of temperature in apps. You can switch between displaying the temperature in either Celsius or Fahrenheit. Apps that support this feature, including Apple's stock Weather app, honor this setting to display the temperature in your preferred unit regardless of your regional settings.
In this tutorial, you will learn how to easily switch between Celsius and Fahrenheit independently of your other regional settings on your iPhone, iPad, or iPod touch, as well as adjust this setting on other Apple devices, such as your Apple TV, Apple Watch, or Mac.