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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 fewer than 31 days. September in the Northern Hemisphere and March in the Southern Hemisphere are seasonal equivalent.

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

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.

September EventsEdit

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 "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]

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

September in Astronomy and AstrologyEdit

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 symbolsEdit


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

Non-Gregorian observances: 2020 datesEdit

Month-long observancesEdit

United States observancesEdit

Food MonthsEdit

Movable Gregorian observances: 2020 datesEdit

First Wednesday: September 2Edit

First Thursday: September 3Edit

First Friday: September 4Edit

September 5Edit

First Sunday: September 6Edit

First Sunday after September 4: September 6Edit

Week of the First Monday: September 6–12Edit

Week of September 10: September 6–12Edit

First Monday: September 6Edit

Nearest weekday to September 12: September 11Edit

Second Saturday: September 12Edit

Saturday after first Monday: September 12–13Edit

Second Sunday: September 13Edit

First Sunday after first Monday: September 13Edit

Week of September 17: September 13–19Edit

Third Tuesday: September 15Edit

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

Third Friday: September 18Edit

Third Saturday: September 19Edit

Weekend of the week of September 17: September 19–20Edit

Third Sunday: September 20Edit

Week of Sunday before September 23: September 20–26Edit

Week of September 22: September 20–26Edit

Last week: September 20–26Edit

Last full week: September 20–26Edit

Third Monday: September 21Edit

Observances pertaining to the September Equinox: September 22Edit

Fourth Friday: September 25Edit

Last Friday: September 25Edit

Last Saturday: September 26Edit

Last Sunday: September 27Edit

Fourth Monday: September 28Edit

Last Wednesday: September 30Edit

Last weekday in September: September 30Edit

Fixed Gregorian observancesEdit


  1. ^ Office, Met. "Met Office: Changing seasons". Archived from the original on 2009-02-25.
  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. ^ 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.
  7. ^ "Astrology Calendar", yourzodiacsign. Signs in UT/GMT for 1950–2030.
  8. ^ a b "Cancer Awareness Month :: Society of Gynecologic Nurse Oncologists".
  9. ^
  10. ^, Spark CMS by. "September Is Thyroid Cancer Awareness Month – ThyCa: Thyroid Cancer Survivors' Association, Inc".
  11. ^ "Promote National Suicide Prevention Month". Retrieved 2019-11-25.
  12. ^ a b c d e f g h i j "Food Days, Weeks, Months – September". UNL Food. University of Nebraska–Lincoln.
  13. ^ Goldstein, Darra (2011). "National Turkey Day". Gastronomica. 11 (4).
  14. ^ "September is Hydrocephalus Awareness Month! Here's What You Can Do…". Hydrocephalus Association. Retrieved 29 July 2016.
  15. ^ "California Wine Month – California Wines".
  16. ^ "September Monthly Observations". 4 January 2016.
  17. ^

Externalism linksEdit