@SimonUrbanek The Tempest Weather application allows you to name your location, and then select it as the location for a widget, so it's not technically unfeasible. Mine is named "Home". Perhaps Windy is programmed in a way that makes it more difficult, but that's not an end-user's problem.
There is technically a way to choose from a favorite within an app, but it appears this is not the case for Windy anymore which is fine, I didn't develop the app. Definitely something you should consider though. Not everyone wants their location/city on public display on their iPhone home-screen. Many people have public lives that involve presentations/YouTube/Streaming where this could dox them and their families.
Allowing a tag/label for a location would fix this and it's definitely not technically unfeasible. There could even be a separate toggle within the Widget to allow users to choose from Saved Favorites within the Windy App rather than an exact spot on a map. OR just allow them to rename it once they choose a spot on the map, visually, on the widget. Source: Other apps do it.
I appreciate you looking into it.