I want to see the temperature in Celsius

To change the temperature measurement from Fahrenheit to Celsius on an iPhone, follow these steps:

1. Open the Settings app on your iPhone.
2. Tap on "Weather"
3. Under Temperature Unit
4. Select "Celsius"
5. The temperature will now be displayed in Celsius

Hope this helps.

See this support page:--> Check the weather on iPhone, at the section "Switch between Celsius and Fahrenheit"

And, change it also as per WeelieNick's suggestion

Regards

Giulio

Go to settings>general>language and region. Here you can choose between celsius and Fahrenheit

Go to settings.

Scroll down until you see Weather on the left. Click on it.

On the right side, scroll down until you see Temperature unit.

select Celsius.

hope this helps!