A semiconductor package and an electronic system including the same include a package board having an electric circuit pattern. A semiconductor chip is mounted on the package board and electrically connected with the circuit pattern of the package board. A non-contact temperature detector is provided with the semiconductor package and detects a temperature of an external heat source without making contact with the external heat source. A temperature controller controls the semiconductor chip according to the temperature of the external heat source that is detected by the non-contact temperature detector.