The weather forecast has been changed to 63 degrees Fahrenheit. How can I change it back?

First, click on the weather software in Apple's mobile phone. After entering the weather software page, click the function in the lower right corner to enter a new page, and then click the icon of Celsius temperature in this page. At this time, at the top of this page, we can see that the temperature of the current city has been switched to 14 degrees.