Depends a little on where in Bali you'll be
*.
But "heating" and "humidity" alone shouldn't be a problem. What you need to watch out for is
fungus and various insects trying to make a home through
any openings in your equipment (like headphone sockets, USB holes, etc). Wasps and ants, in particular. I am
not joking.
* I lived near Ubud for a while with my PCs - maybe the seasons at the time weren't the best, but I found that fungus there was a bigger problem than where I live now (Sanur).
