A device for determining the temperature in the interior of a vehicle (12) comprises a temperature sensor (30) for arrangement behind a wall (18) adjacent the interior, and a processing unit (82) receiving the measuring signal from the temperature sensor (30) and outputting an output signal representing the temperature in the interior (10) of the vehicle (12). Further, it is provided with a thermal conductor element (36, 36null) for sensing the temperature of the air in the interior (10) in the region close to the wall, the thermal conductor element (36, 36null) being in thermally conductive contact with the temperature sensor (30) and being provided to extend up to or close to the wall (18) or through an opening (38) in the wall (18).