Just another thought and another option.
I used to have a pair of walking shoes which are much lighter than boots and ideal for the summer. Also waterproof, as there is always wet grass and unexpected stuff you come across. Unfortunately they disappeared – we think I left them in the boot of my car the day I sold it 😥 !
So last year I tried to replace these also. I couldn’t find any synthetic ones which would fit – I have one foot about half a size bigger than the other, so boots and shoes are always a bit of a compromise. Eventually I was offered a pair of Brashers. These are leather with a Gore-Tex lining, much lighter than leather boots and very comfortable. I really like them, but only for summer use really.