Accordingly the embodiments herein achieve a method and apparatus for estimating power consumption based on a temperature. The method includes dividing a use time and a non-use time based on an analysis of a correlation of a determined temperature and a power consumption based on the determined temperature. Further, the method includes extracting a base consumption of an electrical apparatus based on power consumption during the non-use time. Further, the method includes extracting a threshold temperature and a power consumption continuous function based on the threshold temperature and power consumption. The threshold temperature requires a maximum operation of the electrical apparatus. Furthermore, the method includes calculating the power consumption based on a predetermined temperature from the power consumption continuous function; and calculating an estimated power consumption except for the base consumption.