elementary OS Snippets: Add My Weather Indicator To Wingpanel: My-Weather-Indicator is a ( Wing )panel-based weather applet that can show weather conditions, a forecast, a forecast map and check sunrise ...
I had to install software-properties-common before I could add the repository:
sudo apt install software-properties-common
sudo add-apt-repository ppa:atareao/atareao
sudo apt-get update
sudo apt-get install my-weather-indicator