Warming problems, e.g., global warming and urban heat island (UHI), increase heat-related health risks for urban residents in hot summers. To improve residents’ well-beingand achieve a healthy city, the People’s Government of Dalian Municipality proposes to build more than 200 new urban green parks by 2049. In this study, the impact of the progress of global warming, the impact of future urban expansion, and the cooling effects of the proposed urban green parks on the future (the 2050 s) thermal environment in Dalianare investigated by dynamical downscaling simulations.Introducing urban green parkscould reduce the air temperatures and the Universal Thermal Climate Index (UTCI) in the surrounding urban areas by about 0.1–0.2 °Cand 0.1 °C, respectively, which can sufficiently offset thetemperatureand heat stress increases caused by the assumed urban expansion.However, it should be noted that the increases in temperatureand heat stress in the urban areas due to future global warming will be much more significant than the cooling effects of the proposed urban green parks.Moreover,deciduous broadleafwoods are recommended as vegetation cover for the proposednew parks,which will help to mitigate the intense heat stress during the day.