It seems that you are right and that the observed temperatures in Australia are higher than the forecast temperatures seen on Windy, at this time of the year.
When you say that there is one global model used: No, the ECMWF model is the default model used by Windy, but you may choose the GFS which seems to show better modelling of the temperature in your country (Btw what do you mean by gws model?)
So it’s may be better for you to switch to GFS for temperature forecasts.
But be sure that the ECMWF has not been infiltrated by «climate change deniers » :-)
You can check it by their communication : https://mobile.twitter.com/ECMWF