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This article is about the month. For other uses, see September (disambiguation).
"Sep." redirects here. For other uses, see SEP.
"Sept." redirects here. For the family word, see Sept.
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September (Listeni/ˌsɛptˈɛmbər/ sep-TEM-bər) is the ninth month of the year in the Julian and Gregorian Calendars and one of four months with a length of 30 days.

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.[1]

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.

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.

The autumnal equinox in the northern hemisphere and the vernal or spring equinox in the southern hemisphere occur on dates varying from 21 September to 24 September (in UTC). In the pagan wheel of the year the spring equinox is the time of Ostara and is celebrated on the first Sunday of September.[3]

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.

Month-long observances[edit]

  • Amerindian Heritage Month (Guyana)
  • Childhood Cancer Awareness Month
  • Gynecologic Cancer Awareness Month
  • Leukemia and Lymphoma Awareness Month
  • Thyroid Cancer Awareness Month

United States observances[edit]

Other observances[edit]

Non-Gregorian observances, 2015 dates[edit]

Movable Gregorian Observances, 2015 dates[edit]

First Friday: September 4[edit]

Saturday before First Monday: September 5[edit]

First Sunday: September 6[edit]

First Sunday after September 4: September 6[edit]

Week of September 10: September 6-12[edit]

First Monday: September 7[edit]

Thursday after the first Sunday: September 10[edit]

Nearest weekday to September 12: September 11[edit]

Weekend after first Monday: September 12-13[edit]

Second Saturday: September 12[edit]

Saturday after first Monday: September 12[edit]

Second Sunday: September 13[edit]

Sunday after first Monday: September 13[edit]

Second Sunday: September 13[edit]

Weekday nearest September 17[edit]

Weekend of the Week of September 17[edit]

Third Friday: September 18[edit]

Saturday closest Sept. 23: September 19[edit]

Third Weekend: September 19-20[edit]

Saturday of the Third Weekend: September 19[edit]

Sunday of the Third Weekend: September 20[edit]

Week of September 22: September 20-26[edit]

Sunday before September 23 to Saturday:September 20-26[edit]

Third Monday: September 21[edit]

Third Tuesday: September 22[edit]

Fourth Friday: September 25[edit]

Last Friday: September 25[edit]

Fourth Sunday: September 27[edit]

Last Sunday: September 27[edit]

Fixed Gregorian observances[edit]

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


The Dutch Finance Minister carrying the 'third Tuesday in September' suitcase, 1983.

September symbols[edit]


  1. ^[dead link]
  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. ^ "Fathers Day in Australia". 
  4. ^ a b c d e f g h i j k "Food Days, Weeks, Months - September". UNL Food. University of Nebraska–Lincoln. 
  5. ^ Goldstein, Darra (2011). "National Turkey Day". Gastronomica 11 (4). 
  6. ^ "". Retrieved 2013-08-22. 
  7. ^
  8. ^
  9. ^
  10. ^
  11. ^
  12. ^
  13. ^ a b c d e  Chisholm, Hugh, ed. (1911). "September". Encyclopædia Britannica (11th ed.). Cambridge University Press. 
  14. ^ SHG Resources. "". Retrieved 2013-08-22. 
  15. ^ "". Archived from the original on February 24, 2013. Retrieved 2013-08-22. 

External links[edit]

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