and I want to take my electric out there and play. It's about 80 degrees, and it's a bit humid. Will this be unsafe to my guitar?
No, it will be fine.
No, bands play outdoor shows all the time and it doesn't hurt their instruments. Unless there is a surprise thundershower or something.
you may need to retune your guitar after a few minutes from the heat, but it wont hurt anything
I play outside all the time my stuff is fine. And I live in Florida.
just think about warped tour (or whatever your favorite outdoor festival might be). its almost ALWAYS in 100 degree heat, and there are people playing music from 10 AM to midnight.