I'm here in Canada and can grow them, so there's no reason you cant!!
I put mine out in the sun during the summer. Pay close attention to watering. It's cooler here at night (high 60's mostly) than you have to deal with so it might not be a problem for you.
With Plumeria, cool + wet = rot.
Since my nights are cool I water in the morning. They can be thirsty. I keep them in full sun.
Once winter hits and they have to come inside, beginning of Sept. here, I back off on watering and let them go dormant. Barely watering only when needed to keep them alive. When they start developing new leaves, roughly March, I start watering again and fertilizing.
You could probably get away without the dormant period down there, especially if you have a nice sunny window they could be in when it cools down (does it cool down?).
