I agree with Karen, better to grow Plumerias outdoors. But do it gradually as suggested since the plant will need to acclimate to conditions outside, maybe a day or two, it already has leaves, so it is ready to receive all the light and heat it can take.
I also agree with Hetty, I do not like using that type of container with attached saucer with succulents, it does not allow quick drain of water.
You are in WA state, your area gets more rain than mine and your temps will be cooler. I would also suggest you improve your media, make it grittier, add more pumice or perlite, so the media gets more porous and well draining. Grown in a glazed container like that, it will hold moisture a bit longer than necessary for the root zone of this plant.
It really grows so good outdoors with the right combination of heat, humidity, light and air flow. My area is horribly dry but it endures the summer heat by daily watering at this time. It varies from growing area to growing area, so be very aware of your humidity and temperature levels there.
