Most of marine grazers are ectotherms, thus their metabolisms are influenced by environmental temperature. How their growth and respiration change with temperature are well-investigated, but the relationship with consumption rate is still poorly known. Grazing pressure is an important factor in regulating primary producer abundance. This research aims to understand how grazing changes with increased temperature. We investigated the difference in the capacity of temperature acclimation for the species having different distribution by comparing their Thermal Safety Margin (TSM, the difference of the summer average seawater temperature and the seawater temperature of the maximum consumption rate). We conducted a laboratory experiment with the two grazers, Idotea ochotensis and Gnorimosphaeroma rayi, which have different geographical distribution. We measured their consumption rates with different temperature levels to know how it changes with warming. The result showed that consumption rate increased first and decreased subsequently with temperature rising. TSM didn’t differ between the two species. Our findings revealed that warming has both positive and negative effects on grazers depending on the degree of increase. Temperature acclimation is not influenced by their geographical distribution, suggesting that local adaptation may have occurred to the temperature variability in the surrounding environment.