2025 Autumnal Equinox Is Monday: 5 Things To Know

The autumnal equinox on Monday officially ushers in the new season and its promise of crisp air, show-stopping fall foliage, and cool evenings just perfect for sitting around a fire pit, or perhaps taking in one of the fall meteor showers.

The autumnal equinox isn’t a daylong event, but rather occurs at the exact moment the sun crosses the celestial equator — that’s at 2:19 p.m. EDT.

The word equinox comes from the Latin words “aequus,” which means “equal,” and “nox,” which means night. That’s led to the perception that everyone worldwide sees the same amount of daylight and nighttime, but it’s not the absolute truth. To be precise, daylight lasts about eight minutes longer than nighttime on the day of the equinox, EarthSky reported.

Speaking of daylight, it’ll be time for the twice-annual clock-changing ritual before you know it. Daylight saving time ends Sunday, Nov. 2, when most Americans will turn their clocks back one hour.

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Here are five other things to know about the September equinox:

You May See Northern Lights

There’s no guarantee, of course, but the chances of seeing stunning northern lights displays increase after the fall equinox. Both the spring and fall equinoxes are good aurora seasons, but autumn produces a surplus of geomagnetic storms — almost twice the annual average. And right now, the chances of seeing auroras are greater now that the sun has reached “solar maximum” in its 11-year cycle and the number of sunspots ramps up.

Equinox Isn’t Always Sept. 2

The date of the September equinox varies. The fall equinox can occur as early as Sept. 21 or as late as Sept. 24, according to Space.com. A Sept. 21 autumnal equinox hasn’t occurred in several millennia, but some folks alive today may see it the next couple of times it rolls around, in 2092 and then again four years later in 2096. And the first day of fall hasn’t fallen on Sept. 24 since 1931, and that won’t happen again until 2303.

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Here’s the reason: A year is defined as 365 days by the Gregorian calendar, but it takes the Earth 365-¼ days to orbit the sun. What this means is the autumnal equinox occurs about six hours later than it did the year prior, which eventually moves the date by a day.

O Canada!

Thank Canada for spectacular fall sunsets with more vivid pinks, reds and oranges than at any other time of the year. As dry, clean Canadian air begins to sweep across the country, fewer colors of the rainbow spectrum are scattered by air molecules. That means the reds, oranges, yellows and pinks make it through for your sunset-viewing pleasure.

Good Time For A Reset

No matter where you are in the world, the sun will rise due east and set due west during the fall equinox (the same thing happens during the spring equinox). For the directionally challenged, it’s a good time for a reset. Go outside around sunset or sunrise, find a landmark and mark the sun’s location in relation to it.

The Animal Kingdom Prepares

Fall isn’t just a time to start winterizing homes against stink bugs and other insects and buttoning up other things outside. It’s rutting — or mating — season for deer, elk and moose, and males will battle it out by thrusting their antlers together until one of them gives up or dies.

Swans, geese and ducks begin their migration south. Frogs burrow deep into mudholes to wait out the winter. Chipmunks retreat to their underground tunnels. Bears eat and drink almost nonstop as they prepare for hibernation.

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