Weather Report uses old API (Met.no LocationforecastLTS API)
Weather Reportuses old API
Weather Reportuses newer API
Met.no LocationforecastLTS API states that this version of the webservice is deprecated, and the plugin needs to be adapted to use a newer version, or it will stop working within a few months. Please file a bug on https://bugzilla.xfce.org if no one else has done so yet.