Mine is more or less correct. Center of Belgium for today gives -1 to +6 and that’s what it is. Cold around freezing temp this morning, maybe 5° at noon and now it’s going back down.
For me (Cape Town, South Africa) it is pretty good. The activity weather stuff comes from Open Meteo. They provide historical forecast data which is awesome. I don’t know if there forecasts are better than Open Weather or not. Maybe you could have a look? Switching would be a bit of work but could be done.