Hello Mustbnuts, I grow Plumerias too, and our weather similar to yours. I have Plumeria Celadine and a noid one. Both grown in containers, once temps starts hitting below 50F overnight, I have to start bringing them indoors to adjust slowly from the environmental change and to prepare for its dormancy.
Patience will be your friend when you wait for them to wake up in mid Spring later. When temps overnight starts going higher than 50F, then I bring them out in part shade first to acclimate again slowly and as the temps warm up it will grow new leaves. Got to wait for at least one good leaf before I start watering them actively again.
Always make your media very well draining, I add a lot of pumice to my mix so when summer time is around, I have no worries of root rot, since the water drains well. During summer time, I have to do daily watering for them since temperatures are just too dry and soaring into the triple digits.