I couldn't really find anything specific to Sabogae. I also tried searching for "Pearl Island, Panama climatology", which also turned up nothing. The best that I found was on a Pearl Islands and Panama tourist site:
This hurricane-free country enjoys a two-season tropical climate
* From December to beginning of May, the cool trade winds blow: sun & wind.
* The rest of the year the green season finds light winds and sporadic rainfall. Better snorkeling, fishing and sea life watching: lees wind, less current.
Temperatures are always between 26-35º C (80;-90º F).
80-90F sound like good temps to start with, and I would say that 50-60% humidity would also be a good starting point.