The jute fiber is one of the strongest lignocellulosic fibers with different applications such as fabrics, ropes as well as engineered composites for automobile parts. In this study, the jute yarns were exposed to different temperatures of the thermal cycles (22°C, 40°C, 80°C, 105°C and 150°C). The mechanical tests were conducted using the 3R Syntax machine and the experimental results depended on different temperatures of thermal cycles were recorded. The mechanical properties of jute yarns decrease with the increase of temperature of the thermal cycles.