A temperature detecting apparatus for adjusting direction of airflow from a fan according to thermal status in an electronic device, includes a detection module, a control module, and a driver module. The detection module detects temperatures of a plurality of position coordinates in the electronic device and converts the detected temperatures and the plurality of position coordinates corresponding to the detected temperatures to first voltage signals. The control module receives the first voltage signals and compares the temperatures of corresponding position coordinates to output a position coordinate of the greatest temperature according to the first voltage signals. The driver module receives the position coordinate of the greatest temperature and directs airflow towards a position having the greatest temperature.