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A temperature probe for use in an air stream for measuring the air temperature plus the adiabatic temperature rise thereof, the probe comprising a body having a chamber provided with an air receiving inlet facing forwardly in said stream, there being spaced ports in the periphery of the body communicating with the chamber allowing a limited escape of air from the rear portion of the chamber, said inlet and port means being related in capacity so that the entering air is brought substantially to rest in the chamber, the body having an insulating chamber in surrounding relation to the first chamber and ports communicating with the insulating chamber to allow a limited air flow therethrough, means on at least one wall of the insulating chamber for preventing heat conduction there‐through, and a temperature sensitive device in said chamber.