The purpose of this paper is to present the experimental results obtained with a prototype of a 4-sector spherical anemometer, in the Aarhus Wind Tunnel Simulator II (AWTSII) reproducing Martian conditions. The main objective of the experimental campaign has been to measure wind velocity for a wide number of yaw and pitch angles, in an environment in the range of typical Mars conditions. The experimental results indicate that wind speed and angle recovery can be achieved with the proposed spherical sensor. The obtained responses are close to the empirical models found in the literature.