The most significant early warning I had of the acute temple pain was a few days of having a very tender scalp. Using a hairbrush or disturbing the hair, was extremely difficult as the tenderness was so severe. After four or five days of this, the symptoms stopped and a night or so later, the temple pain suddenly switched on. I mean suddenly without warning, from nothing to really strong. Since that time, I have never had the tender scalp again, but the temple pain is always there to some extent or other, (about three months).
It would be interesting to know of any other GCA sufferers with tenderness of the scalp at any time during or preceeding their head pains.