Magnetic nanocolloids are ultra-stable dispersions of magnetic nanoparticles (NPs). This class of materials have been gaining visibility in research and technology centers due to their broad application potential. In the case of a charged magnetic nanocolloids, the stability can be monitored by the zeta potential of NPs, which is strongly related to parameters such as NPs shape and size, viscosity and pH. Temperature is another important factor, since it affects the properties of the medium and the charge of NPs through the protonation and deprotonation of surface groups. This study aims to contribute to a better understanding of how temperature can modify the properties of a colloid, in addition to serving as a basis for possible technological applications in systems using thermodiffusion and thermoelectricity effects. In this context, this survey proposes a study of the effect of temperature on the zeta potential of a water-based magnetic nanocolloid sample with charged core-shell NPs based on cobalt ferrite (CoFe2O4@ɤ-Fe2O3) obtained via hydrothermal co-precipitation. The NPs and the colloid sample have been previously characterized using XRD, TEM, and SAXS. To investigate the effects of temperature, zeta potential measurements were performed in the temperature range of 25-60 °C, with different ionic strengths and using different co-ions. The zeta potential decreases with increasing temperature, which can be related to the decrease of the surface charge and the viscosity of the medium. The zeta potential also decreases with increasing ionic strength due to the screening effect of the counter-ions. Finally, the nature of the co-ions slightly changes the zeta potential due to its different intrinsic ionic mobilities.