Customize the yahoo-weather-location which supports chinese characters and then:

M-x yahoo-weather-mode

You can set yahoo-weather-guess-location-function to a function that sets yahoo-weather-location string. For now there’s only yahoo-weather-ipinfo, which gets location from https://ipinfo.io/ server.

(setq yahoo-weather-guess-location-function #'yahoo-weather-ipinfo)

By default it will only display the weather and temperature.

You can specify yahoo-weather-format to display more information and access other settings by M-x customize-group yahoo-weather.