September is the ninth month of the year in theJulian andGregorian calendars. Its length is 30 days.
September, from theTrès Riches Heures du Duc de BerryIn recent decades, the number of warm temperature records in September has outpaced cold temperature records over a growing portion of Earth's surface.[1]
September in theNorthern Hemisphere andMarch in theSouthern Hemisphere are seasonally equivalent. In the Northern Hemisphere, the beginning of the meteorologicalautumn is on 1 September. In the Southern Hemisphere, the beginning of the meteorologicalspring is on 1 September.[2]
Ancient Roman observances for September includeLudi 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. TheSeptimontium was celebrated in September, and on December 11 on later calendars. These dates do not correspond to the modern Gregorian calendar.
September was called the "harvest month" inCharlemagne's calendar. September corresponds partly to theFructidor and partly to theVendémiaire of thefirst French republic. September is calledHerbstmonat, harvest month, in Switzerland. TheAnglo-Saxons called the monthGerstmonath, barley month, that crop being then usually harvested.[4]
In the United States, September is one of the most common birth months (third most popular after August and July, which both have 31 days), as all but one Top 10 most common birthdays are in September, based on theNational Center for Health Statistics statistics on births between 1994 and 2014. The most common birthday is September 9 (#1), least common is September 1 (#250).[5][6][7]
TheSeptember equinox takes place in this month, and certain observances are organized around it. It is theAutumn equinox in the Northern Hemisphere, and theVernal equinox in the Southern Hemisphere. The dates can vary from 21 September to 24 September (inUTC).
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.
^"Mean Monthly Temperature Records Across the Globe". National Centers for Environmental Information (NCEI) of the National Oceanic and Atmospheric Administration (NOAA). Link is an example for one month; for other months, change the "202501" in the preceding URL toyyyymm, whereyyyy is the four-digit year andmm is the two-digit month (01=January through 12=December)
^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.
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