When Is Autumn _verified_ Jun 2026

Autumn is an important season for many reasons:

Here are the key dates of autumn:

Because the Earth takes roughly 365.25 days to orbit the sun, the specific timing shifts slightly every year. From this point forward, the days continue to shorten and the nights lengthen until the winter solstice. 2. Meteorological Autumn (The Calendar approach) when is autumn

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For most people, the official start of autumn is the . This is the moment when the sun crosses the celestial equator, making day and night nearly equal in length. Northern Hemisphere: Usually occurs on September 22 or 23 . Southern Hemisphere: Usually occurs on March 20 or 21 . Autumn is an important season for many reasons:

While the arrival of autumn feels like a simple shift in the wind, the answer to "when is autumn" actually depends on whether you are talking to a meteorologist, an astronomer, or your local barista.

Decreasing daylight triggers deciduous trees to stop producing chlorophyll, revealing the vibrant reds, oranges, and yellows. Meteorological Autumn (The Calendar approach) Here is the

. This is the exact moment when the sun crosses the celestial equator, making day and night nearly equal in length. Northern Hemisphere (2026): Tuesday, September 22, at 8:04 P.M. EDT. Southern Hemisphere (2026): Friday, March 20, at 14:46 UTC. Why it moves: Because the Earth’s orbit isn't a perfect circle and takes roughly 365.25 days, the equinox date can shift between September 21, 22, or 23 from year to year. 2. The Meteorological Answer: By the Calendar If you prefer a tidier schedule, you’re likely on "Team Meteorological." Meteorologists and climatologists divide the year into four equal three-month periods to make record-keeping and data comparison easier. Northern Hemisphere: September 1 to November 30. Southern Hemisphere: March 1 to May 31. The logic: This system aligns better with "calendar months" and captures the three-month transition period when temperatures typically drop before the deep cold of winter. 10 sites The difference between meteorological and astronomical ... Feb 19, 2025 —