ERA5 regular grid - from discrete to continuous


I downloaded data from ERA5-Land in a netCDF format, which is interpolated into a regular grid. I want to view the data as continuous, which means that each tile is assigned a value, but to my understanding, the grid points represent discrete values and don't correspond to tiles. What is the best way to get an average value for a tile? Maybe to make my own interpolation using the 4 grid points in the tile's vertices?