The flour beetles (Tribolium spp) are the most extensive pest in the world. Tribolium confusum Jaquelin du Val (Coleoptera: Tenebrionidae) is associated with human stored products and cause damage resulting quantitative and qualitative losses. Laboratory experiment was conducted to study the biology of T. confusum under the effect of three different temperature degrees (25, 30, 35 ̊C) and 70 % related humidity. The life cycle consisted of egg, larval, pupa and adult. The eggs hatched in 4-5, 2-3 and 3-4 days, the larval duration varied from 32-33, 19-20 and 18-19 days, pupal period of insect ranged 9-11, 6-8 and 5-6 days and adult period from new emerged up to able to produce (oviposition) ranged 5-6, 3-4 and 4-5 days at 25, 30 and 35 ̊C respectively. The average total life spam durations from eggs to adult’s oviposition were 53, 33 and 32 days at 25, 30 and 35 ˚C and constant relative humidity. Which concluded that the standard optimum temperature for T. confusum fitness lie between the range of 30-35⁰C and a relatively high humidity of 70 percent.