In this contribution we have determined densities and kinematic viscosities at atmospheric pressure and four temperatures, T = (293.15, 303.15, 313.15 and 323.15) K for six binary systems formed by three pyridinium-based ionic liquids (1-butylpyridinium tetrafluoroborate, 1-butyl-3-methylpyridinium tetrafluoroborate, or 1-butyl-4-methylpyridinium tetrafluoroborate) and two alkanols (methanol or ethanol). Kinematic viscosities were fitted using a four-body McAllister equation. From experimental densities and kinematic viscosities, absolute viscosities and viscosity deviations were calculated. The viscosity deviations for all systems are negative over the entire composition and temperature ranges. This behavior can be justified by the weakening of the interactions in the pure components during the mixing process.