To understand the forming limits of aerospace grade lightweight materials under warm forming conditions, two aluminum alloys (AI2024 and 7075) were tested under warm biaxial loading conditions. In the first phase of this study, sheet blanks of 150 × 150 mm were hydraulically bulged bi-axially without a counter die or restriction at two different strain rates, 0.0013 and 0.013s -1, and four different temperature levels, 25, 100, 200, and 300°C. Based on these tests, flow curves were obtained for different test conditions to reveal the effect and significance of temperature and strain rate on he forming of aluminum sheets. In the secord phase, the same size sheet blanks of two alloys were hydroformed into a closed, axisymmetric die under hydraulic pressures of 10 and 15 MPa, and at temperature levels of 25 and 200°C. Three parameters namely, cavity filling ratio (CFR), thickness, and hardness were measured and analyzed to understand he effect of pressure rate and temperature on forming limits.