How many days until autumn?
Days until autumn
The autumn equinox is shared worldwide, but its calendar date can change across time zones. The time above is local to you.
This time is an astronomical estimate; the date may be refined when official data is published.
See the time left until the autumn equinox, whether it arrives in September or March where you live.
Autumn is a change in the light
The autumn equinox arrives in September north of the equator and in March to the south. It is the point this countdown follows—not the first chilly morning or the first leaf to change color.
Are day and night exactly equal?
They are close, but not usually equal to the minute. The atmosphere bends sunlight, and sunrise and sunset are measured from the Sun’s visible edge. “Equinox” describes the astronomical crossing; the daylight you see also depends on your latitude.
Why leaves keep their own schedule
Shorter days are one cue for many trees, but temperature, rainfall and species also shape the color change. A forest may turn weeks before or after the equinox. In places without a pronounced leaf season, the shift in daylight can be the clearer sign.
Autumn or fall?
Both names describe the same season in English. Whether you call it autumn or fall, the northern countdown points to the September equinox and the southern countdown to the March equinox. The exact local calendar date can differ across time zones.