Why does the weather on Apple's mobile phone show such a high temperature?

Because the temperature you see is Fahrenheit, not Celsius, which is commonly used in China.

Because there are two ways to express the temperature in the world, the general mobile phone will support two displays: Fahrenheit and Celsius.

Switching method:

Open the weather of apples.

Click the expand button (three horizontal lines) in the lower right corner of the weather interface.

Click the Fahrenheit/Celsius toggle button.

After switching to the display in degrees Celsius, C will light up.