I'm also considering this plant for my yard, and while I don't have any experience with it, the research I've been doing on this species over the past week seems to indicate it can take temperatures into the mid 20s but will defoliate or die back to the ground (but come back up once it warms up). My climate is very similar to yours, maybe just a tad warmer with winter lows ranging from the mid 40s to mid 30s, with drops into the upper 20s on about 1-3 nights a year.

Based on what I've read, I feel confident enough the plant would survive the winter here that I would probably buy one if I saw it for sale. Any experience anyone has with this species in the Bay Area (or California in general) would be greatly appreciated though! I think the Spicy Jatropha is the closest thing to Plumerias any of us in California will be able to grow outdoors, haha.

Thank you for your reply, which I missed until now!

I planted it in the spot and it really took off. I'll cover it if nighttime temps dip any further.