A process fluid temperature measurement system (300) includes a thermowell (200) configured to couple to a process fluid conduit and extend through a wall (102) of the process fluid conduit. A temperature sensor assembly (110) is disposed within the thermowell (200) and includes a first temperature sensitive element (304) and a second temperature sensitive element (306). The first temperature sensitive element (304) is disposed within the thermowell (200) adjacent a distal end (305) of the thermowell (200). The second temperature sensitive element (306) is spaced apart from the first temperature sensitive element (304) along a spacer (308) having a known thermal conductivity. Transmitter circuitry (311) is coupled to the first (304) and second temperature sensitive elements (306) and is configured to perform a heat flux calculation to provide a process fluid temperature output.
