The 2026 autumn equinox arrives on Tuesday, September 22, at 8:04 p.m. EDT, marking the astronomical start of fall in the Northern Hemisphere. The celestial event brings nearly equal daylight and darkness, shorter days, and shifting seasonal weather patterns across the United States.
The celestial shift happens at the exact same moment worldwide, according to astronomical calculations. For the Northern Hemisphere, the September equinox occurs as the Sun crosses the celestial equator going from north to south, while the Southern Hemisphere experiences its vernal equinox as the Sun crosses from south to north.
Timing and Coordinates for the 2026 September Equinox
The exact timing of the equinox varies by time zone. While the official timestamp is set for 8:04 p.m. Eastern Daylight Time on Tuesday, September 22, the date of the equinox may differ by plus or minus one calendar day depending on a location’s specific time zone.
The word equinox originates from the Latin roots aequus
, meaning equal, and nox
, meaning night. On this day, day and night are roughly equal in length across the globe. Following this threshold, the Sun continues to rise later and nightfall arrives earlier each day across the Northern Hemisphere, culminating in the winter solstice.
Weather Projections and Foliage Outlooks in New Jersey
Regional weather patterns are already responding to the seasonal change. Following a scorching summer marked by heat waves and humidity, temperatures have begun to ease, with weekend highs dropping into the low 70s and potential drops into the 60s in parts of the Garden State, according to regional reporting.
Forecasters from AccuWeather anticipate that warm summer conditions will linger into early autumn across parts of the eastern United States. In New Jersey, autumn temperatures are projected to average 1 to 2 degrees above normal, with expected rainfall near normal ranges of 3.7 to 4 inches per month through September and October, and slightly over 3 inches in November.
At the same time, the Climate Prediction Center, affiliated with the National Weather Service, projects below-normal temperatures for most of late September, followed by warmer-than-normal conditions through much of October.
Leaf color displays will vary significantly by geography this year. Northern and central areas are anticipated to see a typical, vibrant foliage season, while South Jersey faces duller leaf colors driven by severe drought conditions over the preceding six months.
Astrological Traditions and the Harvest Moon Connection
Beyond astronomy, the equinox holds a prominent place in Western astrology, where the Sun enters zero degrees Libra. Astrologer and tarot reader Theresa Reed connects the fall equinox with Libra’s cardinal themes of balance, fairness, and reviewing goals established during the spring equinox.
Folk traditions also link the season to the lunar calendar. The full moon occurring nearest to the autumnal equinox is traditionally designated as the Harvest Moon. Unlike most months when the moon rises about an hour later each night, the alignment of the Earth’s tilt and the Moon’s orbit around the equinox causes it to rise only 20 to 30 minutes later for several consecutive nights, providing extra evening light historically utilized by farmers harvesting crops before the first hard frosts.