Plan ahead, one week at a time
How Many Weeks Until First Day of Autumn 2027?
70 weeks and 3 days to go.
That gives you a 70-week runway before First Day of Autumn on Wednesday, September 22, 2027.
Counting in weeks matches how people actually plan — by weekend and weekly routine. The free iPhone app keeps the weeks remaining on your home screen with reminder alerts.
493
days
First Day of Autumn
Outside
Free iPhone app with home screen widgets. Used by 300k+ people.
The week-by-week countdown to First Day of Autumn 2027
- Weeks remaining: 70 plus 3 days
- Whole weekends ahead: 70
- That works out to 493 total days
- Event date: Wednesday, September 22, 2027
First Day of Autumn 2027 is 70 weeks and 3 days away, landing on Wednesday, September 22, 2027 — that works out to 493 days in total. First Day of Autumn is an astronomical season that begins at a solstice or equinox, the precise moment Earth's tilt reaches a turning point. First Day of Autumn falls on a Wednesday this year, a midweek date — worth noting if you want to plan time off around it.
Counting down turns a vague "soon" into a clear number of days you can plan around — booking travel, sending cards, or simply building anticipation. Many people begin preparing for a date like this two to three months ahead, and a visible countdown helps pace that preparation rather than leaving everything to the final week. If you are counting down to First Day of Autumn, you can add a free Outside countdown widget to your iPhone home screen; it updates every day and can be shared with friends and family.
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More ways to track First Day of Autumn
Turn this date into a shared plan, a home screen habit, or a deeper browse session through related countdown pages.
Share First Day of Autumn with friends
Give everyone the same countdown, reminders, and widgets so the date stays visible for the whole group.
Open page →Put First Day of Autumn on your lock screen
Keep the countdown one glance away with a lock screen widget that updates automatically every day.
Open page →Browse Seasonal Countdowns
Open a hub of related countdown pages so you can keep exploring the strongest cluster around this event.
Open page →What you can do with 70 weeks before First Day of Autumn
With 70 weeks and 3 days left, First Day of Autumn 2027 is close enough to start preparing in earnest yet far enough away to do it without stress. Each remaining week is a natural checkpoint — book travel one week, sort logistics the next, handle final details in the last. First Day of Autumn falls on a Wednesday, so plan the surrounding weekend accordingly.
The Science Behind First Day of Autumn
Seasons are driven by the tilt of Earth's axis — roughly 23.5 degrees — not by how close the planet is to the Sun. As Earth orbits, each hemisphere leans toward or away from the Sun, changing the angle of sunlight and the length of the day. The astronomical start of a season is pinned to a solstice or an equinox, the precise moment that geometry reaches a turning point.
That is why the start of First Day of Autumn 2027 lands on a specific date and even a specific time, rather than the first of a month. Equinoxes bring near-equal day and night worldwide; solstices mark the longest or shortest day of the year. Knowing the exact changeover is useful for gardeners, photographers, and anyone tracking daylight hours.
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Frequently Asked Questions
How many weeks until First Day of Autumn?
There are 70 weeks and 3 days until First Day of Autumn 2027. Counted in full weeks, that gives you a 70-week runway to plan before it lands on September 22, 2027.
How many weeks and days until First Day of Autumn?
First Day of Autumn 2027 is 70 weeks and 3 days away. Breaking the wait into weeks makes it easier to pace planning week by week rather than watching a single large day count.
How many weekends are there until First Day of Autumn?
There are roughly 70 weekends before First Day of Autumn 2027, since each remaining week brings one. That is a useful number for scheduling trips, shopping, or prep that can only happen on a Saturday or Sunday.
How many full weeks are left until First Day of Autumn?
70 complete weeks remain until First Day of Autumn 2027, plus 3 extra days. The event itself falls on a Wednesday.
Why count down to First Day of Autumn in weeks instead of days?
Weeks match how most people actually plan — by weekend, pay period, or weekly routine. A 70-week countdown to First Day of Autumn 2027 turns a far-off date into a manageable number of weekly checkpoints.
When is First Day of Autumn 2027?
First Day of Autumn 2027 falls on Wednesday, September 22, 2027 — 70 weeks and 3 days from today.
How can I track the weeks until First Day of Autumn?
The free Outside app shows First Day of Autumn 2027 as a home screen countdown widget on your iPhone, so the weeks remaining stay in view and update automatically each week.
What causes First Day of Autumn to begin?
First Day of Autumn begins because of the 23.5-degree tilt of Earth's axis. As the planet orbits the Sun, each hemisphere leans toward or away from it, changing sunlight and day length. The season's astronomical start is pinned to a solstice or equinox.
Is the start of First Day of Autumn the same date every year?
Not exactly. Because the solstice and equinox follow Earth's orbit rather than the calendar, the start of First Day of Autumn can shift by a day or two from year to year. 2027 has its own precise changeover date and time.
What is the difference between meteorological and astronomical First Day of Autumn?
Meteorological seasons are fixed three-month blocks used by forecasters, while astronomical seasons are defined by solstices and equinoxes. The date counted here is the astronomical start of First Day of Autumn 2027.
