Nowadays, the main Internet traffic is provided by wireless networks due to their mobility. Therefore, it should be more attention paid on efficiency of wireless network and find appropriate methods which could predict performance of considered network. In the paper spatial (3D) prediction of wireless network has been proposed. The data for research were collected from open WiFi network named PWR-WiFi located in building belonging to the main campus of Wrocław University of Science and Technology in Poland. Spatial prediction models of wireless network efficiency were performed by kriging estimation method.