First Day of Autumn 2021


When is the First Day of Autumn 2021?

The First Day of Autumn 2021 is on Wednesday, September 22, 2021 (in 90 days).  Calendar for 2021
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.

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 2021 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: Autumn on Wikipedia

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 2022?

The First Day of Autumn 2022 is on Friday, September 23, 2022 (in 456 days).  Calendar for 2022

Dates for the First Day of Autumn from 2016 to 2026

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 2016      September 22, 2016      Thursday      1736 days ago
First Day of Autumn 2017      September 22, 2017      Friday      1371 days ago
First Day of Autumn 2018      September 23, 2018      Sunday      1005 days ago
First Day of Autumn 2019      September 23, 2019      Monday      640 days ago
First Day of Autumn 2020      September 22, 2020      Tuesday      275 days ago
First Day of Autumn 2021      September 22, 2021      Wednesday      in 90 days
First Day of Autumn 2022      September 23, 2022      Friday      in 456 days
First Day of Autumn 2023      September 23, 2023      Saturday      in 821 days
First Day of Autumn 2024      September 22, 2024      Sunday      in 1186 days
First Day of Autumn 2025      September 22, 2025      Monday      in 1551 days
First Day of Autumn 2026      September 23, 2026      Wednesday      in 1917 days
Data provided 'as is' without warranty

First Day of Autumn 2021 Dates of the First Day of Autumn 2021 and surrounding years as downloadable image file




Printable 2021 Calendars


Calendar templates 2021 for Word, Excel and PDF
Calendar templates 2021 for Word, Excel and PDF

2021 calendar as templates for
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A selection of calendar templates for 2021 in landscape and portrait orientation and with US federal holidays, suitable for a variety of applications.

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Dates of other holidays, events and celebrations

Christian (and related)
Advent
Advent Sunday
All Hallows' Eve
All Hallows' Day
All Saints' Day
All Souls' Day
Ascension Day
Ash Wednesday
Black Saturday
Boxing Day
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Candlemas
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Christmastide
Corpus Christi
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Eastertide
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Epiphany Eve
Fat Tuesday
First day of Lent
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Holy Week
Jesus' Birthday
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Lent
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Maundy Thursday
Orthodox Easter
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Pascha
Pentecost
Pentecost Sunday
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Shrove Tuesday
St. Andrew's Day
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St. George's Day
St. Patrick's Day
St. Stephen's Day
Theophany
Three Kings Day
Trinity Sunday
Twelve Days of Christmas
Twelfth Night
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US federal holidays
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Martin Luther King Day (MLK Day)
Presidents' Day
    (Washington's Birthday)
Memorial Day
Independence Day (4th of July)
Labor Day
Columbus Day
Veterans Day
Thanksgiving Day
Christmas Day

Canadian holidays
Canadian Thanksgiving

Australian holidays
ANZAC Day

The seasons
Spring
Vernal equinox (spring equinox,
March equinox)
Summer
Summer solstice (June solstice)
Autumn / Fall
Autumn equinox (fall equinox,
September equinox)
Winter
Winter solstice (December solstice)

Other days
April Fools Day
Armed Forces Day
Black Friday
Buy Nothing Day
Cinco de Mayo
Constitution Day
Cyber Monday
Daylight Saving Time
Day of the Dead
Día de los Muertos
Earth Day
Election Day
Father's Day
Flag Day
Giving Tuesday
Grandparents' Day
Groundhog Day
Halloween
Indigenous Peoples' Day
International Women's Day
Mother's Day
Native American Day
New Year's Day
New Year's Eve
Panic Saturday (Super Saturday)
Parents' Day
Star Wars Day
Samhain
Small Business Saturday
Summer time
Super Saturday (Panic Saturday)
Teacher Appreciation Day
Teacher Appreciation Week
Valentine's Day
World Environment Day
World Teachers' Day



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