This article evaluates the offshore wind potential internationally using Merra-2 and ERA5 data at 50 m and 100 m heights. In response to the increasing global energy demand and environmental concerns, the study aims to identify promising sites for offshore wind energy and optimize their exploitation. The analysis covers 14 sites, including wind farms in USA, Norway, China, United Kingdom, and France, and evaluation sites in Madagascar, Spain, Morocco, and South Korea. The study details real wind speed and power density statistics based on annual and monthly analyses and classification according to the NREL table. The Weibull distribution parameters are determined using four methods: Maximum Likelihood, WAsP, Least Square, and Openwind. The wind rose, capacity factor, and annual energy output are examined to provide an in-depth understanding of potential performance. The results show that at 100 m, Norway produces 9 GWh/year in winter, Madagascar reaches 12 GWh/year in August, and Morocco achieves 8.5 GWh/year in summer. At this height, the evaluated turbines show up to 68% capacity factors. At 50 m, only the EWT DW 52–500 turbine is suitable, with a capacity factor exceeding 30%, except in Vietnam, Algeria, Namibia, and Chile, which have class 2 and 1 potential. This study assists researchers and decision-makers in evaluating and optimizing sites for wind energy projects.