In this Letter we present a high temperature multipoint sensing method using sapphire fiber air gap-based extrinsic Fabry–Perot interferometers. Three sensors are fabricated and tested in a single sensing link. Experimental results show that the air gap-based high temperature sensors have a very high temperature sensitivity $\left(>20\text{\hspace{0.17em} nm}/°\text{C}\right)$ and resolution $\left(<0.3°\text{C}\right)$ and are capable of operating at temperatures well above $1000°\text{C}$ . The multiplexed sapphire sensors present a significant advancement over traditional single-point sensors for critical high temperature applications.