Hawaii temperature is generally warm, their rain maybe warmer rain. Kind of like the setting in my homeland. Plumerias in my homeland thrive in our torrential rains and flooding, since temps over there never go below 70F, rain there is warm temperature, think spa-like temps. And lots of humidity as the temperature rises. Soil there is rich loam and volcanic, so very good drainage. That is why you will never ever see them being grown indoors since they can grow into very tall majestic trees easily.
Unlike here, our temps fluctuate a lot, easily a variance of 30 degrees daytime to night time. Indoors, pretty sure few of us keeps our temps at the 80F to 85F, that will be too nosebleed for me. I keep my house only at 68F during winter. So got to wait patiently for mid Spring to safely bring them out if overwintered, and I do not water them at all when inside, just letting them take their nap.
Then there are Plumie varieties that can handle colder temps. That is the one I have. This year I have pushed the envelope and left them outdoors this winter. Thankfully we did not get any low 20F's this time, just in the 30F to 35F overnight range mostly. But it sure has been too rainy than usual and our overnight cold duration has been several weeks longer this time. I do see some tip damage, but it is not escalating, pretty much with the dry intervals outdoors with more airflow, the plant is also callusing the area on its own. During our long hot period here, I do have a struggle with humidity levels, it is just too dry here, so when it comes around, have to water this plant daily here while outdoors. During winter time, ideally I prefer to keep them dry, but Mother Nature has her own winter plans this year, so just going with the flow. I keep checking on the base of my sleeping Plumies, it is rock hard solid, so it is coping, I guess weather hardened enough already.
Other varieties will simply hate our cold temps, harder to wake them up from slumber too.
