I noticed if you installed the xfce4-weather-plugin (0.8.9) and added it to the panel you were unable to select your location (search didn't work).
So I've backported the 0.8.10 version from 18.04 to Peppermint 8
If you want to install it, run:
sudo apt-get update && sudo apt-get install xfce4-weather-plugin
Then right-click on the panel and select:-
Panel > Add New Itemsand add the "
Weather Update" plugin.
Once on the panel, right-click it and set your "
Properties".