A process fluid temperature measurement system (390, 500) comprising: a thermally-insulative collar configured to couple to a process fluid conduit wall; a thermowell (104, 200, 400) configured to couple to a process fluid conduit via the thermally-insulative collar and extend through the process fluid conduit wall; a temperature sensor assembly disposed within the thermowell (104, 200, 400), the temperature sensitive assembly including: a first temperature sensitive element disposed within the thermowell (104, 200, 400) adjacent a distal end of the thermowell (104, 200, 400); a spacer having a known thermal conductivity, the spacer being formed of a powder; a second temperature sensitive element spaced apart from the first temperature sensitive element along the spacer; and transmitter circuitry coupled to the first and second temperature sensitive elements (304, 306) and configured to perform a heat flux calculation to provide a process fluid temperature output, wherein the second temperature sensitive element is disposed within the thermowell (104, 200, 400), wherein the heat flux calculation is based on the thermal conductivity of the distal end of the thermowell (104, 200, 400) and the thermal conductivity of the spacer between the first and second temperature sensitive elements (304, 306), wherein the heat flux calculation is based on a ratio of the thermal conductivity of the distal end of the thermowell (104, 200, 400) to the thermal conductivity of the spacer, wherein the process fluid temperature output is equal to the temperature measured by the first temperature sensitive element added to a quantity that is a difference in measurements between the first and second temperature sensitive elements (304, 306) multiplied by the ratio, wherein the transmitter circuitry (310, 311, 324) includes a microprocessor configured to perform the heat flux measurement, and wherein the transmitter circuitry (310, 311, 324) includes communication circuitry configured to communicate the process fluid temperature output to a remote device. a thermally-insulative collar configured to couple to a process fluid conduit wall; a thermowell (104, 200, 400) configured to couple to a process fluid conduit via the thermally-insulative collar and extend through the process fluid conduit wall; a temperature sensor assembly disposed within the thermowell (104, 200, 400), the temperature sensitive assembly including: a first temperature sensitive element disposed within the thermowell (104, 200, 400) adjacent a distal end of the thermowell (104, 200, 400); a spacer having a known thermal conductivity, the spacer being formed of a powder; a second temperature sensitive element spaced apart from the first temperature sensitive element along the spacer; and transmitter circuitry coupled to the first and second temperature sensitive elements (304, 306) and configured to perform a heat flux calculation to provide a process fluid temperature output, wherein the second temperature sensitive element is disposed within the thermowell (104, 200, 400), wherein the heat flux calculation is based on the thermal conductivity of the distal end of the thermowell (104, 200, 400) and the thermal conductivity of the spacer between the first and second temperature sensitive elements (304, 306), wherein the heat flux calculation is based on a ratio of the thermal conductivity of the distal end of the thermowell (104, 200, 400) to the thermal conductivity of the spacer, wherein the process fluid temperature output is equal to the temperature measured by the first temperature sensitive element added to a quantity that is a difference in measurements between the first and second temperature sensitive elements (304, 306) multiplied by the ratio, wherein the transmitter circuitry (310, 311, 324) includes a microprocessor configured to perform the heat flux measurement, and wherein the transmitter circuitry (310, 311, 324) includes communication circuitry configured to communicate the process fluid temperature output to a remote device. a first temperature sensitive element disposed within the thermowell (104, 200, 400) adjacent a distal end of the thermowell (104, 200, 400); a spacer having a known thermal conductivity, the spacer being formed of a powder; a second temperature sensitive element spaced apart from the first temperature sensitive element along the spacer; and transmitter circuitry coupled to the first and second temperature sensitive elements (304, 306) and configured to perform a heat flux calculation to provide a process fluid temperature output, wherein the second temperature sensitive element is disposed within the thermowell (104, 200, 400), wherein the heat flux calculation is based on the thermal conductivity of the distal end of the thermowell (104, 200, 400) and the thermal conductivity of the spacer between the first and second temperature sensitive elements (304, 306), wherein the heat flux calculation is based on a ratio of the thermal conductivity of the distal end of the thermowell (104, 200, 400) to the thermal conductivity of the spacer, wherein the process fluid temperature output is equal to the temperature measured by the first temperature sensitive element added to a quantity that is a difference in measurements between the first and second temperature sensitive elements (304, 306) multiplied by the ratio, wherein the transmitter circuitry (310, 311, 324) includes a microprocessor configured to perform the heat flux measurement, and wherein the transmitter circuitry (310, 311, 324) includes communication circuitry configured to communicate the process fluid temperature output to a remote device.