The ancient Greeks believed that Venus, as an evening "star," and Venus, as a morning "star," were different objects. As such, they named the evening "star" Hesper, and that's where the name of Hesperia originates (it also means "land of the west").
Jupiter has dropped out of the evening sky, leaving Venus, Mars and Saturn (both in Ophiuchus — the "serpent-bearer") as evening "stars" this month, although Jupiter will re-appear as a morning "star" in October.
The autumnal equinox, the first day of fall, occurs on Sept. 22, and we can welcome cooler weather. We also have no notable meteor showers in September.
Overhead are Cygnus (the swan), and its "asterism," the Northern Cross, as well as Pegasus (the mythical flying horse); zodiacal constellations Sagittarius (the archer), Capricorn (the sea goat), and Agauarius (the water-carrier). And a vast swath of the Milky Way, our own galaxy, stretching from north-east to south-west.
See you in October!