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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, 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 on the oldest known Roman calendar, with March (Latin Martius) the first month of the year until perhaps as late as 153 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 AstrologyEdit

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 symbolsEdit


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

Non-Gregorian observances: 2018 datesEdit

(Please note that all Baha'i, Islamic, and Jewish observances begin at sundown prior to the date listed, and end at sundown of the date in question unless otherwise noted.)

Month-long observancesEdit

United States observancesEdit

Food MonthsEdit

Movable Gregorian Observances, 2017 datesEdit

First Friday: September 1Edit

First Sunday: September 3Edit

Week of the First Monday: September 3–9Edit

First Monday: September 4Edit

First Wednesday: September 6Edit

First Thursday: September 7Edit

Thursday after the first Sunday: September 7Edit

Saturday after first Monday: September 9Edit

Second Saturday: September 9Edit

Weekend after first Monday: September 8–10Edit

Week of September 10: September 10–16Edit

First Sunday after September 4: September 10Edit

Second Sunday: September 10Edit

First Sunday after first Monday:September 11Edit

Nearest weekday to September 12: September 12Edit

Third Friday: September 15Edit

Third Saturday: September 16Edit

Weekend of the Week of September 17: September 16–17Edit

Week of September 17: September 17–23Edit

Week of September 22: September 17–23Edit

Week of Sunday before September 23: September 17–23Edit

Third Sunday: September 17Edit

Weekday nearest September 17: September 18Edit

September 17 but observed on previous Friday if it falls on a Saturday or following Monday if on a Sunday: September 18Edit

Monday after third Sunday: September 18Edit

Third Monday: September 18Edit

Third Tuesday: September 19Edit

Observances pertaining to the September Equinox: September 22Edit

Fourth Friday: September 22Edit

Saturday closest to September 23: September 23Edit

Last week: September 24–30Edit

Last full week: September 24–30Edit

Last Week of the Month: September 24–30Edit

Last Sunday: September 24Edit

Fourth Monday: September 25Edit

Last Wednesday: September 27Edit

Last weekday in September: September 29Edit

Last Friday: September 29Edit

Last Saturday: September 30Edit

Fixed Gregorian observancesEdit


  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. ^ a b c d e f g h i j "Food Days, Weeks, Months – September". UNL Food. University of Nebraska–Lincoln. 
  10. ^ Goldstein, Darra (2011). "National Turkey Day". Gastronomica. 11 (4). 
  11. ^ "September is Hydrocephalus Awareness Month! Here's What You Can Do…". Hydrocephalus Association. Retrieved 29 July 2016. 
  12. ^ "California Wine Month – California Wines". 
  13. ^ "September Monthly Observations". 4 January 2016. 
  14. ^ AnydayGuide. "Egyptian Engineering Day / September 5, 2017". 

External linksEdit