This study examines the dependence of tide amplitudes in the upper atmosphere on long-period tropical oscillations, specifically the Quasi-Biennial Oscillation (QBO) of zonal wind in the equatorial stratosphere and the El Niño–Southern Oscillation (ENSO). Numerical simulations of global atmospheric circulation are performed with the nonlinear mechanistic Middle and Upper Atmosphere Model (MUAM) for different combinations of QBO/ENSO phases. The structures of migrating and non-migrating diurnal and semidiurnal tides are calculated. The analysis focuses on boreal winter (January–February), when planetary waves (PWs) reach peak activity and contribute to the nonlinear generation of non-migrating tides. The results demonstrate, in particular, that the migrating diurnal westward propagating tide (DW1) is amplified during the westerly QBO phase (wQBO) and under La Niña conditions. For the semidiurnal migrating tide (SW2), ENSO effects are found to be more pronounced than those of the QBO. During El Niño, the tide’s amplitude decreases in the equatorial region while increasing to the North and South of it, regardless of the QBO phase. Changes in non-migrating tides differ from those of migrating tides with similar periods, which is attributed to the altered wave activity of the stationary PW with zonal wave number 1 (SPW1). The effect of strengthening/weakening of non-migrating diurnal westward propagating tide (DW2) generation for different combinations of QBO/ENSO is demonstrated explicitly by considering the terms responsible for the nonlinear interaction of PW1 and DW1 in the balance equation of perturbed potential enstrophy. Idealized simulations isolating the effects of QBO and ENSO, allowed for the differentiation of the influences of these two oscillations. Such separation is difficult with observational data, where limited time series restrict sample size and reduce statistical power to distinguish between these closely related phenomena.