Hello kbuntu, I think your plant will just slow down a bit in growth but not go totally deciduous as it does here. I have seen Plumerias in my homeland where our temps are in similar range as yours. Plumies there do shed some leaves but for the most part not go totally leafless as it does here.
I will follow though Hetty's advise to trim down the leaves and Gigi's advise to water sparingly till new leaves form again.
