Through the GUI i want to create a template sensor that is:
List item
Based on the Met.no integration that support daily forecast type
Every evening at 22:00hr checks this forecast
Displays precipitation value in mm
I have a similar setup in pure yaml that is working, but i cant recreate this through the GUI
You will need to call an action to get the information needed in the template, which is not possible in the GUI. The old version also most likely uses a trigger based template sensor, which is also not possible (yet) in the GUI.
As Edwin said it is not possible to do this as a straight template sensor through the GUI.
If you really want something that can be done 100% GUI, you could use an automation that runs the necessary actions and save the value to a number helper.
Yes, the yaml original version is indeed trigger based.
Thought of future proofing my setup with creating GUI versions, but seems this is not working yet