Glass fiber bundles with different gage lengths (25, 50, 100, 150, 200 and 300 mm) were tested under quasi-static loading at a strain rate of 1/600 s-1 using a MTS load frame, and samples with a gage length of 25 mm were tested under dynamic tensile loading at four different strain rates (40, 80, 120 and 160 s-1) and four distinct temperatures (25, 50, 75, 100 ℃) utilizing a drop-tower impact system. The experimental results show that the mechanical properties are dependent on the gage length, strain rate and temperature. Young's modulus increases with the increasing gage length and strain rate, but decreases with the increasing temperature. Tensile strength decreases with the increase of the gage length, but increases with the increase of the strain rate, while it decreases firstly and then increases as the temperature increases. Ultimate strain decreases with the increase of the gage length, but increases as the temperature increases. Finally, Weibull statistics were used to quantify the degree of variability in yarns' strength at different gage lengths, strain rates and temperatures, and the obtained Weibull parameters can be used for engineering application.