This article is about the month. For other uses, see September (disambiguation).
"Sep." and "Sept." redirect here. For other uses of Sep., see SEP. For the family division, see Sept.

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 and the third month to have the length of 30 days. It is also the month with the longest name.[1]

September in the Northern Hemisphere 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.[2]


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 (Roman month) (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.[3] 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 last 1st century BC, an extra day was added in honor of the deified Julius Caesar on 4 September. 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.[4] September corresponds partly to the Fructidor and partly to the Vendémiaire of the first French republic.[4] On Usenet, it is said that September 1993 (Eternal September) never ended. September is called Herbstmonat, harvest month, in Switzerland.[4] The Anglo-Saxons called the month Gerstmonath, barley month, that crop being then usually harvested.[4]

September in Astronomy and Astrology

Meteor showers 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


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

Non-Gregorian observances, 2016

(please note that all Jewish observances, which are set by the Hebrew calendar, begin at sunset the day prior to the date listed and end on the sunset of the date in question)

Month-long observances

United States observances

Food Months

Movable Gregorian Observances, 2016 dates

Movable Western Christian observances, 2016 dates

Movable Eastern Christian observances, 2016 dates

First Thursday: September 1

First Friday: September 2

Saturday before First Monday: September 3

First Sunday: September 4

Week of September 10: September 4–10

First Monday: September 5

First Wednesday: September 7

Thursday after the first Sunday: September 8

Saturday after first Monday: September 10

Second Saturday: September 10

Week of September 17: September 11-17

First Sunday after September 4: September 11
Second Sunday: September 11
Nearest weekday to September 12: September 12
Weekday nearest September 17: September 16
Third Friday: September 16
Saturday of the Third Weekend: September 17

Weekend of the Week of September 17: September 17-18

Sunday of the Third Weekend: September 18

Week of September 22: September 18-24

Week of Sunday before September 23: September 18-24

Last full week: September 18-24

Third Monday: September 19
Third Tuesday: September 20
Observances pertaining to the September Equinox: September 22
Fourth Friday: September 23
Last Saturday: September 24

Last Sunday: September 25

Fourth Monday: September 26

Last Week of the Month: September 25-Oct 1[30]

Last Friday: September 30

Last weekday in September: September 30

Fixed Gregorian observances


  1. "The Longest Month Name (Soldier Ant)". Retrieved 2016-11-28.
  3. 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.
  4. 1 2 3 4  Chisholm, Hugh, ed. (1911). "September". Encyclopædia Britannica (11th ed.). Cambridge University Press.
  5. SHG Resources. "". Retrieved 2013-08-22.
  6. "". Archived from the original on February 24, 2013. Retrieved 2013-08-22.
  9. 1 2
  18. 1 2
  21. 1 2 3 4 5 6 7 8 9 10 11 "Food Days, Weeks, Months - September". UNL Food. University of Nebraska–Lincoln.
  22. Goldstein, Darra (2011). "National Turkey Day". Gastronomica. 11 (4).
  23. "September is Hydrocephalus Awareness Month! Here's What You Can Do…". Hydrocephalus Association. Retrieved 29 July 2016.
  30. "Banned Books Week". Banned Books Week. Retrieved 2016-08-05.
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