Gujarat area situated in the Cambay rift basin of western India is one of the potential geothermal fields due to its enormous prospects as an oil and gas producing reservoir. The present study attempts to better constrain reservoir temperature by employing the multicomponent fluid geothermometry technique. As the thermal waters in this region undergo extensive mixing with non-thermal saline waters; most of the chemical geothermometers fail to provide the correct estimation of reservoir temperature. For example, the silica and K–Mg geothermometers predict reservoir temperatures below the surface discharge temperatures of the thermal fluids, whereas Na–K and Na–Li geothermometers estimate a wide range of subsurface temperatures (169–226 °C). Na–K–Ca geothermometer computes 158–175 °C as reservoir temperature for thermal waters from Lasundra, Tuwa, and Tulsishyam regions. To solve this ambiguity and to better constrain the reservoir temperature, a multicomponent geothermometry modelling is carried out using GeoT program. Fluid reconstruction is carried out by incorporating the dilution phenomenon. The GeoT modelling of the reconstructed fluids at Dholera region (DH-1) determines the subsurface temperature in the range of 138 ± 7 °C, which matches closely with the values obtained from Na–K–Ca geothermometer (120–126 °C). In the case of thermal waters from Lasundra, Tuwa, and Tulshishaym regions, the GeoT modelling results give a concordant estimation of reservoir temperature in the range of ~ 165 ± 10 °C. This integrated multicomponent method thus emerges as the only viable alternative in providing the correct estimation of reservoir temperature in medium enthalpy geothermal systems.