Abstract: Based on a cruise observations from July 19 to 23, 2023, combined with satellite remote sensing data and reanalysis data from June to August of the same year, this study investigates the upwelling characteristics in the southern Taiwan Strait during the cruise period, and examines the upwelling intensity variations and their relationship with the wind field, tidal mixing and background currents throughout the summer. Results identify three distinct upwelling zones: the Dongshan coastal upwelling, the central Taiwan Bank upwelling, and the outer-edge Taiwan Bank upwelling. In the summer of 2023, the Dongshan coastal upwelling, primarily driven by southwesterly winds, exhibits significant temporal variability, peaking in the early July, with an approximately one-day lagged correlation between the upwelling intensity and the along-shore wind speed. The central Taiwan Bank upwelling is mainly controlled by tidal mixing, maintaining relatively stable intensity with persistent cold-water characteristics throughout summer. In contrast, the outer-edge Taiwan Bank upwelling is primarily governed by background currents constrained by topography, with its upwelling intensity at the lower layer (i.e., 30 m) strongly correlated with eastward along-isobath current and further modulated by wind stress curl. These findings provide important scientific insights for a deeper understanding of the characteristics and variability of upwelling in the southern Taiwan Strait.