A west wind is a wind that blows from the west, in an eastward direction. In Western tradition, it has usually been considered the mildest and most favorable of the directional winds.
In Greek mythology, Zephyrus was the personification of the west wind and the bringer of light spring and early summer breezes; his Roman equivalent was Favonius. In the myth of Cupid and Psyche, Zephyrus was the attendant of Cupid, who brought Psyche to his master's palace.
Geoffrey Chaucer wrote of the "swete breth" of Zephryus, and a soft, gentle breeze may be referred to as a zephyr, as in Shakespeare's Cymbeline (IV, ii): "They are as gentle / As zephyrs blowing below the violet, / Not wagging his sweet head."