How does Apple mobile phone add or delete weather cities?

First, click the weather on the iPhone home screen.

If you enter the weather for the first time, the weather of several cities will be defaulted.

Then slide the city bar to the left, and deletion will appear.

After clicking Delete, the weather information of this city will be deleted.

If you need to add a new city, click the plus sign.

Just enter the city you want to add.

You can see the weather in the city after the search.