Update: Just seen that you are referring to a custom WeeWX skin and not the new PWS support now built directly into the OS Weather Service. I don’t have any experience of the Skin so will leave it to others to feedback on this.
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@alco, which instructions did you follow? I can see that OSPi is not successfully calling the weather service. Did you test that the local Weather Service was receiving your PWS data from WeeWX ? Happy to help but I need to understand a bit more about your set-up.
Note that there is a defect in the System Diagnostic page that is displaying the wrong Temp and Humidity data. The only relevant fields are the Last Weather Call and Last Successful Weather Call.