Cuprate high-temperature superconductors (HTSCs) exhibit a characteristic dome-shaped dependence of the superconducting transition temperature on the charge carrier concentration, Tc(p), featuring a maximum at optimal doping p = 0.16. Near the p = 1/8 composition, a sharp suppression ("dip") of Tc occurs - conventionally referred to as the "1/8 anomaly" - which is widely attributed to charge and spin ordering in the CuO2 planes. Here, we investigate the room temperature hydration of La2-xBaxCuO4 and YBa2Cu3O6+delta under a high-frequency magnetic field and report anomalous weight changes during the initial stage of the process. For both compounds, the doping dependence of these weight fluctuations closely mirrors their respective Tc(p) profiles, including the signature "1/8 anomaly". The prominent manifestation of these characteristically low-temperature electronic features at room temperature provides critical insights into the stability of high-energy electronic correlations. These findings may offer a novel foundation for the development of theoretical models of cuprate superconductivity.