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Several studies have highlighted the potential negative impact of climate change on groundwater reserves, but additional work is required to help water managers plan for future changes. In particular, existing studies provide projections for a stationary climate representative of the end of the century, although information is demanded for the near future. Such time‐slice experiments fail to account for the transient nature of climatic changes over the century. Moreover, uncertainty linked to natural climate variability is not explicitly considered in previous studies. In this study we substantially improve upon the state‐of‐the‐art by using a sophisticated transient weather generator in combination with an integrated surface‐subsurface hydrological model (Geer basin, Belgium) developed with the finite element modeling software “HydroGeoSphere.” This version of the weather generator enables the stochastic generation of …