Effects of temperatures on development, mortality, fecundity, and viability of boll weevil, Anthonomus grandis grandis Boheman, were assessed at 10, 15, 20, 25, 30, 35, 40, 45, 48ºC, humidity=60%, and photoperiod 13:11 (L:D) h.. The low temperature threshold for development of boll weevil was 8.3ºC. Boll weevil stopped laying eggs at 10ºC and at 46.8ºC. The average development time was reduced by 3.6-fold and the preovipositional period by 3.3-fold when the temperature was increased from 15ºC to 30ºC. Males developed faster than females by 1.9 - 3.6 d. The number of degree-days required to complete development at 25ºC was 285.6 for females and 248.8 for males. Reduction of the temperature from 30ºC to 15ºC increased the death rate of boll weevil 3.9-fold. An average fecundity of boll weevil at 20ºC, 25ºC, and 30ºC was 13.4-fold higher than at temperatures of 15ºC and 35ºC . The life history of boll weevil was profoundly affected by the temperature. Detailed data for temperature development, survivorship, and reproduction of boll weevils are needed for predicting their population dynamics in cotton field.