In September, your binoculars will reveal the rusty surface of Mars, iconic rings of Saturn, the waxing Moon—and the comet Giacobini-Zinner, which passes through the constellation of Auriga.
Capricornus also hosts a dense cluster of stars, M30. A small telescope easily resolves individual stars in the cluster.
Comet Giacobini-Zinner, which became visible last month, should reach its brightest in September as it passes through the constellation of Auriga and between Gemini and Orion.
It may be barely visible to the naked eye, but possible to see with binoculars. Look for the comet in the east after midnight.