This research aimed to evaluate the effect of different constant temperatures and host grain species (cowpea, chickpea, and horse bean) on fertility table parameters, the developmental stages duration, and accumulated thermal units required for development of Callosobruchus maculatus. Data arranged in fertility tables indicated that the intrinsic rate of increase (r_m) of C. maculatus reared on cowpea was higher (0.062, 0.109 and 0.126) than those reared on chickpea (0.061, 0.046, and 0.112) or horse bean (0.062, 0.076 and 0.084 females/female/day) at 25, 30 and 35^oC, respectively. There was an inverse relationship between the generation time and temperature degrees, C. maculatus reared on cowpea exhibited the shortest duration of generation in comparison with those reared on chickpea or horse bean at 25, 30 and 35^oC, respectively. The eggs produced from C. maculatus females raised on cowpea significantly hatched early compared to females raised on chickpea or horse bean and chickpea. With respect to larval and pupal stages, as well as pre-oviposition period, the cowpea followed by chickpea was suitable for the development of larval and pupal stages in comparison with horse bean at all temperature degrees. The average accumulated thermal units required for development of eggs deposited by females raised on cowpea, chickpea, and horse bean was 82.87, 104.10 and 101.45 degree-days, respectively. While, thermal units required for larval-pupal, pre-oviposition period, and completion one generation raised on cowpea, chickpea, and horse bean was (304.88, 436.65, and 452.58DDs), (4.34, 5.64, and 8.15 DDS) and (385.91, 524.68, and555.82DDS), respectively.