Why is the ninth month called September?
mid-14c., "worldly, secular," later "of time, terrestrial, earthly" (late 14c.), "temporary, lasting only for a time" (late 14c.), from Old French temporal, from Latin temporalis "of time, temporary," from tempus (genitive temporis) "time, season, proper time or season," of unknown origin. Related: Temporality.
temporal tem·po·ral2 (těm'pər-əl, těm'prəl)
Of, relating to, or near the temples of the skull.