The application told me to form a bug report, so here I am! It gave me a message as follows:
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.
*** Bug 13546 has been marked as a duplicate of this bug. ***
According to the changelog API 1.2 will expire at 2017-05-09, however a commit was made to use API 1.3 and version 0.8.9 released.
Please check if this version solves the problem.
1 - http://api.met.no/weatherapi/locationforecastlts/1.3/documentation#version_1_3___2017_02_13
2 - https://git.xfce.org/panel-plugins/xfce4-weather-plugin/commit/?id=e3f53da02a6c4918c0436a8a459f81f1c9eac131
Ops, there was a bug already reported for this.
*** This bug has been marked as a duplicate of bug 13527 ***