First Day of Autumn 2023


When is the First Day of Autumn 2023?

The First Day of Autumn 2023 is on Saturday, September 23, 2023 (in 236 days).  Calendar for 2023
Please note: The dates given on this page are based on Coordinated Universal Time (UTC), which for practical purposes is equivalent to Greenwich Mean Time (GMT). While Autumn starts and ends at the same moment in time all over the Northern Hemisphere, the date of the First Day of Autumn differs from location to location depending on a location's time zone. For more details see the explanations below.
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What is the First Day of Autumn?

Autumn dawn. Photo: flickr.com/photos/jamesjordan/1531979022Autumn dawn
The first day of autumn marks the beginning of the autumn season (usually called fall in North America), one of the four seasons that make up the year.

Astronomical autumn vs. meteorological autumn

There are various ways to define the start and end dates of autumn. The two most commonly used ones are based on the astronomical calendar and the meteorological calendar. Astronomical and meteorological autumn start and end on different dates.

Astronomical autumn

In the astronomical calendar the start and end dates of autumn are based on the changing position of Earth in relation to the sun and the resulting solar events of equinoxes and solstices. In the Northern Hemisphere summer ends and autumn starts at the moment of the September equinox, which occurs every year between September 21 and 24. Autumn ends and winter starts at the moment of the December solstice, which occurs every year between December 20 and December 23. In the Southern Hemisphere autumn lasts from the March equinox (March 19 to 21) to the June solstice (June 20 to 22).

The start and end dates for autumn given on this page are the dates of astronomical autumn in the Northern Hemisphere and are based on Coordinated Universal Time (UTC), which for practical purposes is equivalent to Greenwich Mean Time (GMT - the time zone of the United Kingdom). While autumn starts and ends at the same moment in time all over the Northern Hemisphere, the date and local time differ from place to place depending on the year and a location's time zone. For locations that are ahead of UTC (further east) it may fall on the day after, and for locations that are behind UTC (further west) it may fall on the day before. To find out the exact date and time of autumn 2023 in your area use this seasons calculator.

Meteorological autumn

Meteorologists, on the other hand, define seasons based on climatic conditions and the annual temperature cycle. It is important for them to be able to compare the same period of time in different years. The length of the astronomical seasons varies between 89 and 93 days, while the length of the meteorological seasons is less variable and is fixed at 90 days for winter in a non-leap year (91 days in a leap year), 92 days for spring and summer, and 91 days for autumn. While the exact definition of a season's timing and length can differ in different areas based on local conditions, in most of the Northern Hemisphere meteorological autumn is generally defined as the three months of September, October and November, with the season starting on September 1 and ending on November 30.

There is no "official rule" which definition of autumn to use, and different countries adhere to different conventions. Most of North America and Europe use astronomical autumn, while Australia and New Zealand use meteorological autumn (however, as these countries are in the Southern Hemisphere, the seasons are opposed and autumn there lasts from March to May). In other cultures, eg. in the traditional Chinese calendar and in Celtic traditions, the September equinox is considered to be roughly the middle of autumn.

Further reading:

Comparison table: meteorological spring vs. astronomical spring

Dates shown apply to the Northern Hemisphere and are based on UTC (GMT)
Sea­son Start End
Mete­oro­logi­cal Astro­nomi­cal Mete­oro­logi­cal Astro­nomi­cal
Spring March 1 March 19 to 21
Spring equi­nox
(vernal equi­nox, March equi­nox)
May 31 June 20 to 22
Summer sols­tice
(June sols­tice)
Sum­mer June 1 June 20 to 22
Summer solstice
(June solstice)
August 31 Septem­ber 21 to 24
Autumn equi­nox
(Fall equi­nox, Septem­ber equi­nox)
Au­tumn
(Fall)
Sep­tem­ber 1 Septem­ber 21 to 24
Autumn equi­nox
(Fall equi­nox, Septem­ber equi­nox)
Novem­ber 30 Decem­ber 20 to 23
Winter sols­tice
(Decem­ber sols­tice)
Winter Decem­ber 1 Decem­ber 20 to 23
Winter sols­tice
(De­cem­ber sols­tice)
February 28 (29) March 19 to 21
Spring equi­nox
(vernal equi­nox, March equi­nox)

When is the First Day of Autumn 2024?

The First Day of Autumn 2024 is on Sunday, September 22, 2024 (in 601 days).  Calendar for 2024

Dates for the First Day of Autumn from 2018 to 2028

The next occurrence of the First Day of Autumn is marked in red.

When is ...? Date      Day of the week      Days away     
First Day of Autumn 2018      September 23, 2018      Sunday      1589 days ago
First Day of Autumn 2019      September 23, 2019      Monday      1224 days ago
First Day of Autumn 2020      September 22, 2020      Tuesday      859 days ago
First Day of Autumn 2021      September 22, 2021      Wednesday      494 days ago
First Day of Autumn 2022      September 23, 2022      Friday      128 days ago
First Day of Autumn 2023      September 23, 2023      Saturday      in 236 days
First Day of Autumn 2024      September 22, 2024      Sunday      in 601 days
First Day of Autumn 2025      September 22, 2025      Monday      in 966 days
First Day of Autumn 2026      September 23, 2026      Wednesday      in 1332 days
First Day of Autumn 2027      September 23, 2027      Thursday      in 1697 days
First Day of Autumn 2028      September 22, 2028      Friday      in 2062 days
Data provided 'as is' without warranty

First Day of Autumn 2023
Dates of the First Day of Autumn 2023 and surrounding years as downloadable image file

Printable 2023 Calendars for Word, Excel and PDF


Calendar templates 2023 for Word, Excel and PDF

Free printable 2023 calendar templates

A selection of downloadable, printable calendar templates for 2023 with US federal holidays, suitable for a variety of applications. Available for Word, Excel and PDF.


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