I would like to humbly suggest we consider https://openweathermap.org/ It looks like it is used in the weather plugin for Gnome ( https://extensions.gnome.org/extension/750/openweather/ ) Also, it has this to say on their FAQ page about FOSS development and API keys: " FOSS developers: we welcome free and open source software and are willing to help you. If you want to use OWM data in your free software application please register an API key and file a ticket describing your application and API key...