Calling it on its own always returns the weather for Ottawa. Id expect it to use the requesting IP's location at the least. Using wttr.in/~LosAngeles returns the weather for "Rua Professora Maria Losângeles Navarro", a street in Brazil.
The weather report is nice but doesn't work too well with rxvt-unicode or with a light-coloured background.
> We were unable to find your location so we have brought you to Oymyakon, one of the coldest permanently inhabited locales on the planet.