Water is the most important external factor controlling weathering of building materials. We study the effect of capillary water under different environmental conditions. We experimentally simulate in the laboratory natural weathering as a function of capillarity, salt content in the water and freeze/thaw cycles with pure water and salt solutions. Then, we establish the critical parameters controlling weathering degree and velocity for selected stones. Finally, we use climate data from meteorological records and from climate models to compare past behavior of stone with future one. In selected places, where water table is close to the surface, we establish its level variation during long periods with meteorological parameters to model the evolution of water table in future climate.