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Effect of temperature on the population of sand crab, Emerita asiatica was studied. Specimens were collected once in a fort night from April 2012 to March 2014 by hand picking method in the intertidal region of Kovalam beach. The temperatures of atmosphere, sea water and wet sand were recorded once in a fortnight. The population presented a smaller incidence of males in relation to females (54.79:45.21); however in September 2012 an inverse pattern occurred (29.50:70.50). Ovigerous females were present in all samples with greater frequencies in September and October 2012 where as the highest juveniles were present in May and August 2012.