The effect of temperature on the tensile and fatigue strength of vibration-welded and unwelded postindustrial waste nylon 6 reinforced with 30 wt% glass fiber (PIWGF) was experimentally examined, and the results were compared to those obtained from a 30 wt% glass fiber reinforced prime nylon 6 compound (PAGF) from a previous study. Fatigue tests were performed under sinusoidal constant amplitude tension-tension load at a stress ratio of R=0.1 and within the frequency range of 2-10 Hz at temperatures from 24 to 120 degrees C. Stress levels from just under the tensile strength down to the run-out point at 5 million cycles were used. It was found that increasing temperature led to a significant decrease in both tensile strength and fatigue life. For PIWGF, there was approximate to 20% strength reduction under both static tensile and cyclic loading as compared to PAGF. For both welded and unwelded PIWGF, the endurance ratio; i.e., the ratio of fatigue strength to static tensile strength, was approximate to 45% regardless of the temperature. The fatigue notch factor (K-f) was between 1.4 and 1.8 for all test temperatures examined. POLYM. ENG. SCI., 55:799-806, 2015. (c) 2014 Society of Plastics Engineers