Rheological parameters of concrete, including yield stress and plastic viscosity, have a major impact on its pumpability. In the present study, the effect of temperature of mixtures with and without superplasticizer on their pumpability, has been studied through laboratory examination of yield stress and plastic viscosity of mixtures at three temperatures of 10, 20 and 30 ° C. In addition to investigating the effect of mixture temperature immediately after production, changes in these parameters over time, at the three temperatures mentioned, were also investigated.The results show that for mixtures without superplasticizer, increasing the temperature, results in increased yield stress. Additionally, the rate of yield stress increase at higher temperatures, was higher compared to that at lower temperatures. In terms of plastic viscosity, the mixture with lower temperature, had the highest amount of plastic viscosity and the rate of plastic viscosity increase over time, was greater for mixtures with higher temperatures. Calculation of the pumping pressure based on the rheological parameters, indicates that shortly after production, higher temperatures do not have a significant effect on pumpability. However, over time, the pumpability of the higher temperature mixtures will decrease, resulting in higher pumping pressure.The results indicate that for mixtures containing superplasticizers, higher concrete temperature, results in a decrease in the pumping pressure during Initial times after production. However, over time, it loses this advantage and will have poorer performance compared to the lower-temperature mixtures.