The N-radial Schrödinger equation is analytically solved. The Cornell potential is extended to finite temperature. The energy eigenvalues and the wave functions are calculated in the N-dimensional form using
the Nikiforov–Uvarov (NV) method. At zero temperature, the energy eigenvalues and the wave functions
are obtained in good agreement with other works. The present results are applied on the charmonium
and bottomonium masses at finite temperature. The effect of dimensionality number is investigated on
the quarkonium masses. A comparison is discussed with other works, which use the QCD sum rules
and lattice QCD. The present approach successfully generalizes the energy eigenvalues and corresponding wave functions at finite temperature in the N-dimensional representation. In addition, the present
approach can successfully be applied to the quarkonium systems at finite temperature