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Astronomical Fall Begins Tuesday: What the Autumnal Equinox Means for Skywatchers – WTOP News
On Tuesday, September 22, 2026, the autumnal equinox officially marked the beginning of fall in the Northern Hemisphere at 8:04 p.m., bringing shorter days until the winter solstice on Dec. 21.
Environment Canada Meteorologist Geoff Coulson predicts a drier, slightly cooler start to the season, though a strong El Nino in the Pacific Ocean suggests warmer-than-normal conditions for Nov and Dec.
Roughly equal day and night lengths occur during the equinox, which derives from the Latin words 'aequus' and 'nox,' while NPR reports the alignment creates a 'henge' effect with city streets.
The Harvest Moon will reach full illumination this Saturday, September 26, appearing full for three days, according to the Farmers Almanac, supplanting the traditional Corn and Hunter moon names.
Daylight saving time will end at 2 a.m. Nov. 1, shifting sunrise and sunset times about one hour earlier than on Halloween, providing more morning light toward the winter solstice.
Day and night are now of equal length and we are heading towards increasingly darker times. Sleep and light specialist Arne Lowden offers tips for managing the transition.
When is calendar autumn beginning? Is it on the same date every year? And what is the difference between meteorological and calendar autumn beginning 2026?