1. Take the example at https://github.com/colloqi/piSignage/tree/master/examples/weather (css, lib folders and index.html file)
2. Change the city at line 38 of index.html
3. Create a zip file of the changed index.html, css and lib folders and upload using Add Asset button under Assets Tab.
4. You can add the weather zip file to the playlist to play the file.