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School starts in September in many countries, such as here, in Belgium
WPA poster, 1940
Sapphire, September birthstone
Forget-me-not, September birth flower

September is the ninth month of the year in the Julian and Gregorian calendars, the third of four months to have a length of 30 days, and the fourth of five months to have a length of less than 31 days. In the Northern Hemisphere September is the seasonal equivalent of March in the Southern Hemisphere.

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.[1] 

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.

September (from Latin septem, "seven") was originally the seventh of ten months in the oldest known Roman calendar, the calendar of Romulus c. 750 BC, with March (Latin Martius) the first month of the year until perhaps as late as 451 BC.[2] 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.

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

September was called "harvest month" in Charlemagne's calendar.[3] September corresponds partly to the Fructidor and partly to the Vendémiaire of the first French republic.[3] On Usenet, it is said that September 1993 (Eternal September) never ended. September is called Herbstmonat, harvest month, in Switzerland.[3] The Anglo-Saxons called the month Gerstmonath, barley month, that crop being then usually harvested.[3]


September in Astronomy and Astrology[edit]

Meteor showers that occur in September include the Aurigids, the Delta Aurigids which occur from mid-September to early October, the Southern Taurids, which occur from September 10 to November 20, and the Andromedids which occur from September 25 – December 25.

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.

September symbols[edit]


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

Non-Gregorian observances: 2019 dates[edit]

See also[edit]

Month-long observances[edit]

United States observances[edit]

Food Months[edit]

Movable Gregorian observances: 2019 dates[edit]

Week of the First Monday: September 1–7[edit]

First Sunday: September 1[edit]

First Monday: September 2[edit]

First Wednesday: September 4[edit]

First Thursday: September 5[edit]

First Friday: September 6[edit]

Saturday after first Monday: September 7[edit]

Second Sunday: September 8[edit]

First Sunday after first Monday: September 8[edit]

First Sunday after September 4: September 8[edit]

Week of September 10: September 8–14[edit]

Nearest weekday to September 12: September 12[edit]

Second Saturday: September 14[edit]

Week of September 17: September 15–21[edit]

Third Sunday: September 15[edit]

Third Monday: September 16[edit]

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

Third Tuesday: September 17[edit]

Third Friday: September 20[edit]

Third Saturday: September 21[edit]

Weekend of the week of September 17: September 21–22[edit]

Week of September 22: September 22–28[edit]

Week of Sunday before September 23: September 22–28[edit]

Observances pertaining to the September Equinox: September 23[edit]

Fourth Monday: September 23[edit]

Last Wednesday: September 25[edit]

Fourth Friday: September 27[edit]

Last Friday: September 27[edit]

Last week: September 22–28[edit]

Last full week: September 22–28[edit]

Last Saturday: September 28[edit]

Last Sunday: September 29[edit]

Last weekday in September: September 30[edit]

Fixed Gregorian observances[edit]


  1. ^ Office, Met. "Met Office: Changing seasons".
  2. ^ 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.
  3. ^ a b c d Chisholm, Hugh, ed. (1911). "September" . Encyclopædia Britannica (11th ed.). Cambridge University Press.
  4. ^ SHG Resources. "". Retrieved 2013-08-22.
  5. ^ "". Archived from the original on February 24, 2013. Retrieved 2013-08-22.
  6. ^ a b "Cancer Awareness Month :: Society of Gynecologic Nurse Oncologists".
  7. ^
  8. ^, Spark CMS by. "September Is Thyroid Cancer Awareness Month – ThyCa: Thyroid Cancer Survivors' Association, Inc".
  9. ^ "Promote National Suicide Prevention Month". Retrieved 2019-11-25.
  10. ^ a b c d e f g h i j "Food Days, Weeks, Months – September". UNL Food. University of Nebraska–Lincoln.
  11. ^ Goldstein, Darra (2011). "National Turkey Day". Gastronomica. 11 (4).
  12. ^ "September is Hydrocephalus Awareness Month! Here's What You Can Do…". Hydrocephalus Association. Retrieved 29 July 2016.
  13. ^ "California Wine Month – California Wines".
  14. ^ "September Monthly Observations". 4 January 2016.
  15. ^ "PLEDGE TO PROTECT KIDS! White Balloon Day 2019". White Balloon Day. Retrieved 2019-11-25.
  16. ^ Contributor, Guest (2019-09-16). "Māori Language Week = Te Wiki o Te Reo Māori 2019". Retrieved 2019-11-25.
  17. ^ "About Conservation Week / Te Wiki Tiaki Ao Tūroa". Retrieved 2019-11-25.
  18. ^ "Sustainable House Day 2019". Sustainable House Day. Retrieved 2019-11-25.

External links[edit]

  • The dictionary definition of September at Wiktionary
  • Media related to September at Wikimedia Commons
  • Quotations related to September at Wikiquote