How do I get my weather data in Fahrenheit?
How do I change my weather temp from centigrade to Fahrenheit?
iPhone 6s Plus, iOS 13
Open the Weather app, and if you see a specific location, tap on the 3 lines icon then tap 
at the bottom right corner to go out into the location menu. From there, tap, on the 
icon at the top right corner, and select Fahrenheit from the menu.