@dropofrain
The problem that you will have is that you often have low humidity along with high heat. I would think that your plumeria plant(s) would benefit from having shade during the hottest time of the day, perhaps between noon and 3:00 PM. During the summer months, I am as likely as not to water all my plumeria (as well as 400 or so orchids) every single day.
What size pot is that plumeria growing in right now? If the pot is filled with roots (we might call it root-bound) you can up-pot it. Plumeria grow quickly when spring arrives and those roots grow just as quickly. I assume your plant(s) are outside as mine are here in Mississippi, and you should be watering and fertilizing now. I use half strength, 20-20-20, every couple of weeks this time of year.