I made the experience that not all data items delivered by the weather service are mapped to openhab binding types and properties. The documentation is poor in this part - you have to have a look into the code to see what is mapped on which type and property.
I use WorldWeatherOnline and had to extend the binding in some cases. I found too that some data is only available by additionally specifying “forecast=0” which is the forecast for the current day.
Hope it helps - Robert