Well right now, we're in the middle of a heat wave, temps most everywhere in the southwest are in the 88-115 degree range. If your plumeria are in those black plastic 1-5 gal. pots most of us use, right now having roots shaded might nt be a bad thing, temps in black plastic pots can get hot enough to bake the roots of our plants. Long as the roots aren't cold and wet. For plumeria, cold and wet conditions cause problems.
After the heat wave passes (hopefully, soon!), you could move your plumeria onto raised wooden benches made from wooden boards laid across concrete blocks, to raise your plumeria up to a warmer spot in any sunlight available, preferably with at least 6 hours sunlight
