September

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September is the ninth month of the year in the Julian and Gregorian calendars. Its length is 30 days.

September, from the Très Riches Heures du Duc de Berry
In recent decades, the number of warm temperature records in September has outpaced cold temperature records over a growing portion of Earth's surface.
Chart shows changes in global average temperature annually in September of each year

September in the Northern Hemisphere and March in the Southern Hemisphere are seasonally equivalent. In the Northern Hemisphere, the beginning of the meteorological autumn is on 1 September. In the Southern Hemisphere, the beginning of the meteorological spring is on 1 September.

September marks the beginning of the ecclesiastical year in the Eastern Orthodox Church. It is the start of the academic year in many countries of the northern hemisphere, in which children go back to school after the summer break, sometimes on the first day of the month. Some Libras and Virgos are born in September, with Virgos being born on September 1st through September 22nd and Libras September 23rd through September 30.

September (from Latin septem, "seven") was originally the seventh month in the oldest known Roman calendar, the calendar of Romulus c. 750 BC, with March (Latin Martius) being the first month of the year until perhaps as late as 451 BC. After the calendar reform that added January and February to the beginning of the year, September became the ninth month but retained its name. It had 29 days until the Julian reform, which added a day.

Events

Ancient Roman observances for September include Ludi Romani, originally celebrated from September 12 to September 14, later extended to September 5 to September 19. In the 1st century BC, an extra day was added in honor of the deified Julius Caesar on 4 September. Epulum Jovis was held on September 13. Ludi Triumphales was held from September 18–22. The Septimontium was celebrated in September, and on December 11 on later calendars. These dates do not correspond to the modern Gregorian calendar.

September was called the "harvest month" in Charlemagne's calendar. September corresponds partly to the Fructidor and partly to the Vendémiaire of the first French republic. September is called Herbstmonat, harvest month, in Switzerland. The Anglo-Saxons called the month Gerstmonath, barley month, that crop being then usually harvested.

In 1752, the British Empire adopted the Gregorian calendar. In the British Empire that year, September 2 was immediately followed by September 14.

On Usenet, it[who?] is said that September 1993 (Eternal September) never ended.[citation needed]

In the United States, September is the third most common birth month, after August and July, which both have 31 days. Nine of the top 10 most common birthdays fall in September, with September 9 being the most common (and December 25 being the least common across the year), according to birth data collected by the National Center for Health Statistics between 1994 and 2014.

Astronomy and astrology

The September equinox takes place in this month, and certain observances are organized around it. It is the Autumn equinox in the Northern Hemisphere, and the Vernal equinox in the Southern Hemisphere. The dates can vary from 21 September to 24 September (in UTC).

September is mostly in the sixth month of the astrological calendar (and the first part of the seventh), which begins at the end of March/Mars/Aries.

Symbols

September's birthstone is the sapphire. The birth flowers are the forget-me-not, morning glory and aster. The zodiac signs are Virgo (until September 22) and Libra (September 23 onward).

Observances

This list does not necessarily imply either official status or general observance.

Sapphire, a birthstone of September

Non-Gregorian

Month-long

United States

Food months

Movable Gregorian

Forget-me-not, the birth flower of September

First Wednesday

First Thursday

First Friday

First Sunday

First Sunday after September 4

Week of the first Monday

Week of September 10

First Monday

Nearest weekday to September 12

Second Saturday

Saturday after first Monday

Second Sunday

First Sunday after first Monday

Week of September 17

Third Tuesday

September 17 but observed on previous Friday if it falls on a Saturday or following Monday if on a Sunday

Third Friday

POW☆MIA Flag.

Third Saturday

Weekend of the week of September 17

Third Sunday

Week of Sunday before September 23

Week of September 22

Last week

Last full week

Third Monday

Pertaining to the September Equinox

Fourth Friday

Last Friday

Last Saturday

Last Sunday

Fourth Monday

Last Wednesday

Last weekday

Fixed Gregorian

School starts in September in many countries, such as Belgium
Morning glories
Morning glories, a birth flower of September
Asters
Asters, a September birth flower.
WPA poster, 1940

References

  1. ↑ "Mean Monthly Temperature Records Across the Globe". National Centers for Environmental Information (NCEI) of the National Oceanic and Atmospheric Administration (NOAA). Link is an example for one month; for other months, change the "202501" in the preceding URL to yyyymm, where yyyy is the four-digit year and mm is the two-digit month (01=January through 12=December)
  2. ↑ .● Source for 1850- raw data: "Global Land and Ocean Temperature Anomalies". National Centers for Environmental Information (NCEI) of the National Oceanic and Atmospheric Administration (NOAA). Archived from the original on 26 March 2026.
    ● Updated data is accessible through Climate at a Glance Global Time Series / Globe / Global Time Series. Choose parameters: Surface: Land and Ocean / Parameter: Average Temperature Anomaly / Time Scale: 1-Month / Month: All Months / Start Year: 1850 / End Year: 20__.
    ● Technical note: data in chart is adjusted to reference period of 1850-1900 (representing pre-industrial era)
  3. ↑ Office, Met. "Met Office: Changing seasons". webarchive.nationalarchives.gov.uk. Archived from the original on 25 February 2009.
  4. ↑ H.H. Scullard, Festivals and Ceremonies of the Roman Republic (Cornell University Press, 1981), p. 84; Gary Forsythe, Time in Roman Religion: One Thousand Years of Religious History (Routledge, 2012), p. 14.
  5. ↑ Wikisource One or more of the preceding sentences incorporates text from a publication now in the public domain: Chisholm, Hugh, ed. (1911). "September". Encyclopædia Britannica. Vol. 24 (11th ed.). Cambridge University Press. p. 653.
  6. ↑ "The most common birthday is around the corner. Here's where yours falls on the list". USA TODAY. Retrieved 9 September 2023.
  7. ↑ Specktor, Brandon (17 September 2020). "Why September Is the Most Popular Month for Birthdays?". Reader's Digest. Retrieved 9 September 2023.
  8. ↑ "Happy birthday to you and you and you: Why Sept. 9 is the most common birthday". TODAY.com. 8 September 2023. Retrieved 9 September 2023.
  9. ↑ SHG Resources. "SHGresources.com". SHGresources.com. Archived from the original on 16 June 2013. Retrieved 22 August 2013.
  10. ↑ "Flowerstower.com". Archived from the original on 24 February 2013. Retrieved 22 August 2013.
  11. ↑ The Earth passes the junction of the signs at 13:30 UT/GMT September 22, 2020, and will pass it again at 19:21 UT/GMT September 22, 2021.
  12. ↑ "Astrology Calendar", yourzodiacsign. Signs in UT/GMT for 1950–2030.
  13. 1 2 "Cancer Awareness Month :: Society of Gynecologic Nurse Oncologists". www.sgno.org.
  14. ↑ "September Is Leukemia and Lymphoma Awareness Month" (PDF). Archived from the original (PDF) on 5 September 2015. Retrieved 19 August 2016.
  15. ↑ Baunfire.com, Spark CMS by. "September Is Thyroid Cancer Awareness Month – ThyCa: Thyroid Cancer Survivors' Association, Inc". www.thyca.org.
  16. ↑ "Promote National Suicide Prevention Month". suicidepreventionlifeline.org. Retrieved 25 November 2019.
  17. 1 2 3 4 5 6 7 8 9 10 "Food Days, Weeks, Months – September". UNL Food. University of Nebraska–Lincoln.
  18. ↑ Goldstein, Darra (2011). "National Turkey Day". Gastronomica. 11 (4): iii–iv. doi:10.1525/gfc.2012.11.4.iii.
  19. ↑ "September is Hydrocephalus Awareness Month! Here's What You Can Do..." Hydrocephalus Association. Retrieved 29 July 2016.
  20. ↑ "California Wine Month – California Wines". www.discovercaliforniawines.com. Archived from the original on 27 November 2018. Retrieved 20 August 2016.
  21. ↑ "September Monthly Observations". 4 January 2016.
  22. ↑ "Home » te Wiki o te Reo Māori". Archived from the original on 6 February 2020. Retrieved 5 February 2020.
  23. ↑ TDT (9 September 2024). "A toast to grandparents". Daily Tribune. Retrieved 24 June 2025.
  24. ↑ "Holiday Calendar - International Crane Day - September 10". Archived from the original on 3 June 2023. Retrieved 28 August 2025.
  25. ↑ "International Week of Deaf People 2025 - World Federation of the Deaf". WFD. Retrieved 11 July 2026.
  26. ↑ "Resolution adopted by the General Assembly on 19 December 2017". docs.un.org. Retrieved 11 July 2026.