A potential thermal performance enhancement method pertaining to solar air collectors (SAC) is the jet impingement technique, which employs turbulence mixing in order to augment the heat transfer coefficient in the absorber surface-air region. In this study, a numerical investigation using finite element method has been performed to analyze the heat transfer behavior of such a SAC design using computational fluid dynamics (CFD) simulations. The simulation studies were performed with RANS k–Ɛ turbulence model in COMSOL Multiphysics software platform for three variations of jet geometry viz. conical, cylindrical, and circular. The performance of the SAC was investigated for a fixed jet diameter ratio of 0.065 and varying stream-wise spacing ratio of 0.435–1.304 under various flow conditions for Reynolds number between 2800 and 14,400. The air jets were arranged beneath the absorber plate and impinged vertically upwards on the heated absorber surface, subjected to incident radiation of 1000 W/m2. Results indicate that an increase in stream-wise pitch leads to an enhancement in useful heat gain due to lesser jet interference, thus leading to better thermal efficiency values. Moreover, the collector design utilizing conical jet configuration performed better than its cylindrical and circular counterparts, with highest thermal efficiency of 77.09% being recorded for Reynolds number of 14,400 and stream-wise pitch ratio of 1.304. As such, it is recommended that the present optimal design can be operated under these parameters for maximum thermal performance.