Why does the weather temperature always show ℉?

Because you have displayed the temperature in Fahrenheit.

The specific steps for setting the temperature in degrees Celsius are as follows:

1, open the weather APP of iPhone.

2. Click the small icon in the lower right corner (as shown in the red box).

3. After input, click ℃/F at the lower left to switch between Fahrenheit and Celsius, where Celsius is Celsius and Fahrenheit is Fahrenheit.