Molecular dynamics simulations were conducted at temperatures of 298.15 K, 273.15 K, 253.15 K, and 233.15 K on three organic electrolytes, composed of 1 M NaPF6 dissolved in strongly coordinating diglyme (DG), mixture of DG and weakly coordinating Tetrahydrofuran (THF) with 2:8 volume ratio, and mixture of DG, THF, and weakly coordinating 1,3-dioxolane (DOL) with 2:4:4 volume ratio, respectively, hereafter denoted as ND, NDT, and NDTD electrolytes for sodium ion batteries. The studies indicate strong Na+-DG coordination that leads to vehicular mechanism, in the sense that Na+ persists to migrate together with strongly coordinating DG in the first coordination shell at all the temperature range. Such vehicular mechanism hinders Na+ migration in the ND electrolyte. In contrast, the introduction of weakly coordinating molecules, such as THF in the NDT electrolyte and THF/DOL in the NDTD electrolyte, considerably perturbs Na+ solvation with various coordinating configurations that include Na+-THF and/or Na+-DOL as well as Na+-PF6- contact ion pair. Such diversity of the coordinating configurations significantly improves Na+ migration, especially in the NDTD electrolyte, which has the highest ionic conductivity as well as the fractional ionic conductivity of Na+ of 3.68±0.36 mS·cm-1 and 1.32±0.11 mS·cm-1, respectively, even at low temperature of 233.15 K.