September

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September (Sep.) is the 9th month of the year in the Gregorian calendar, coming between August and October. It has 30 days. Its name comes from the Latin word sept for "seven" (it was the seventh month of the year, before January and February were added to the beginning of the year.)

September always begins on the same day of the week as December, but never ends on the same day of the week as any other month.

The Month

A Works Progress Administration Poster, from 1940, for September

In the old Roman calendar, September was the seventh month, which is where it got its name ("Septem" means "seventh"). The ninth month at the time was November ("Novem" means "ninth"). With Julius Caesar's calendar reform, September became the ninth month, with 30 days. September comes after August and before October.

September begins on the same day of week as December every year, as each other's first days are 13 weeks (91 days) apart. No other month in any year, common or leap year, ends on the same day of the week as September.

In common years, September starts on the same day of the week as April and July of the previous year, and in leap years, October of the previous year. In common years, September finishes on the same day of the week as April and December of the previous year, and in leap years, July of the previous year. In leap years and years immediately after that, September starts on the same day of the week as January of the previous year.

In years immediately before common years, September starts on the same day of the week as June of the following year, and in years immediately before leap years, March and November of the following year. In years immediately before common years, September finishes on the same day of the week as March and June of the following year, and in years immediately before leap years, August and November of the following year.

September is one of two months to have an equinox (the other is March, its seasonal equivalent in both hemispheres), where both day and night are roughly of equal length, occurring either on the 22nd or 23rd, half way between the June and December solstices. In the Northern Hemisphere, Autumn (Fall) begins in this month, while in the Southern Hemisphere, this is the beginning of Spring. For meteorologists, the people who study the weather, these seasons begin on September 1 in those hemispheres. In most Northern Hemisphere countries, school starts in this month, following the summer holidays.

In Ancient Greece, September was called Boedromion. The Anglo-Saxons called it Gerstmonath, meaning "Barley month", referring to the harvest. In other countries, it is referred to as Autumn Month, such as in Finland (Syyskuu) and German-speaking parts of Switzerland (Herbstmonat).

Ethiopian New Year occurs in September. Jewish New Year also often occurs in this month.

Other Languages
Afrikaans: September
Alemannisch: September
አማርኛ: ሰፕቴምበር
Ænglisc: Hāligmōnaþ
Аҧсшәа: Цәыббра
العربية: سبتمبر
aragonés: Setiembre
ܐܪܡܝܐ: ܐܝܠܘܠ
armãneashti: Yizmâciunu
arpetan: Septembro
অসমীয়া: ছেপ্টেম্বৰ
asturianu: Setiembre
Atikamekw: Kakone pisimw
Avañe'ẽ: Jasyporundy
авар: Сентябр
Aymar aru: Llamp'u phaxsi
azərbaycanca: Sentyabr
Bahasa Banjar: Siptimbir
Bân-lâm-gú: 9 goe̍h
башҡортса: Сентябрь
беларуская: Верасень
беларуская (тарашкевіца)‎: Верасень
भोजपुरी: सितंबर
Bikol Central: Setyembre
български: Септември
Boarisch: Septemba
bosanski: Septembar
brezhoneg: Gwengolo
català: Setembre
Чӑвашла: Авăн уйăхĕ
Cebuano: Septiyembre
čeština: Září
chiShona: Gunyana
chiTumbuka: Seputembala
corsu: Settembre
Cymraeg: Medi
dansk: September
davvisámegiella: Čakčamánnu
Deitsch: September
Deutsch: September
ދިވެހިބަސް: ސެޕްޓެމްބަރު
dolnoserbski: September
eesti: September
Ελληνικά: Σεπτέμβριος
emiliàn e rumagnòl: Setèmber
English: September
эрзянь: Таштамков
español: Septiembre
Esperanto: Septembro
estremeñu: Setiembri
euskara: Irail
eʋegbe: Anyɔnyɔ
فارسی: سپتامبر
Fiji Hindi: September
føroyskt: September
français: Septembre
Frysk: Septimber
furlan: Setembar
Gagauz: Ceviz ay
Gàidhlig: An t-Sultain
galego: Setembro
贛語: 九月
ગુજરાતી: સપ્ટેમ્બર
客家語/Hak-kâ-ngî: 9-ngie̍t
хальмг: Һаха сар
한국어: 9월
Hausa: Satumba
Hawaiʻi: Kepakemapa
հայերեն: Սեպտեմբեր
हिन्दी: सितम्बर
hornjoserbsce: September
hrvatski: Rujan
Igbo: Septemba
Ilokano: Septiembre
বিষ্ণুপ্রিয়া মণিপুরী: সেপ্টেম্বর
Bahasa Indonesia: September
interlingua: Septembre
Interlingue: Septembre
ᐃᓄᒃᑎᑐᑦ/inuktitut: ᓯᑎᒻᐳᕆ
isiXhosa: Eyomsintsi
íslenska: September
italiano: Settembre
עברית: ספטמבר
Basa Jawa: Sèptèmber
kalaallisut: Septemberi
Kapampangan: Septiembri
ქართული: სექტემბერი
कॉशुर / کٲشُر: سیٚپٹَمبَر
kaszëbsczi: Séwnik
қазақша: Қыркүйек
kernowek: Mis Gwyngala
Kinyarwanda: Nzeri
Kiswahili: Septemba
Kreyòl ayisyen: Septanm
kurdî: Rezber
Кыргызча: Сентябрь
кырык мары: Сентябрь
Ladino: Septembre
лакку: Сентябрь
лезги: Сентябрь
ລາວ: ກັນຍາ
latgaļu: Rudiņa mieness
Latina: September
latviešu: Septembris
Lëtzebuergesch: September
lietuvių: Rugsėjis
Ligure: Settembre
Limburgs: September
Livvinkarjala: Syvyskuu
lumbaart: Setember
magyar: Szeptember
मैथिली: सितम्बर
македонски: Септември
Malagasy: Septambra
മലയാളം: സെപ്റ്റംബർ
Malti: Settembru
Māori: Mahuru
მარგალური: ეკენია
مصرى: سبتمبر
Bahasa Melayu: September
Baso Minangkabau: September
Mìng-dĕ̤ng-ngṳ̄: 9 nguŏk
мокшень: Тюжягов
မြန်မာဘာသာ: စက်တင်ဘာ
Na Vosa Vakaviti: Sepiteba
Nederlands: September
Nedersaksies: September
नेपाली: सेप्टेम्बर
नेपाल भाषा: सेप्टेम्बर
日本語: 9月
Napulitano: Settembre
нохчийн: Сентябрь
Nordfriisk: September
Norfuk / Pitkern: Septemba
norsk: September
norsk nynorsk: September
Nouormand: Septembre
Novial: Septembre
occitan: Setembre
олык марий: Идым (тылзе)
oʻzbekcha/ўзбекча: Sentabr
ਪੰਜਾਬੀ: ਸਤੰਬਰ
Pangasinan: Setyembre
پنجابی: ستمبر
پښتو: سپټمبر
Перем Коми: Сентяб
ភាសាខ្មែរ: ខែកញ្ញា
Piemontèis: Stèmber
Tok Pisin: Septemba
Plattdüütsch: September
polski: Wrzesień
Ποντιακά: Σταυρίτες
português: Setembro
Qaraqalpaqsha: Sentyabr
qırımtatarca: Sentâbr
Ripoarisch: Sepptämmber
română: Septembrie
Runa Simi: Tarpuy killa
русиньскый: Септембер
русский: Сентябрь
саха тыла: Балаҕан ыйа
Gagana Samoa: Setema
संस्कृतम्: सितम्बर
sardu: Cabidanni
Scots: September
Sesotho sa Leboa: Lewedi
shqip: Shtatori
sicilianu: Sittèmmiru
سنڌي: سيپٽمبر
SiSwati: ÍNyoni
slovenčina: September
slovenščina: September
ślůnski: Wrześyń
Soomaaliga: Sebteembar
کوردی: ئەیلوول
српски / srpski: Септембар
srpskohrvatski / српскохрватски: Septembar
Basa Sunda: Séptémber
suomi: Syyskuu
svenska: September
Tagalog: Setyembre
Taqbaylit: Ctamber
tarandíne: Settèmmre
татарча/tatarça: Сентябрь
తెలుగు: సెప్టెంబర్
tetun: Setembru
тоҷикӣ: Сентябр
ᏣᎳᎩ: ᏚᎵᏍᏗ
Türkçe: Eylül
Türkmençe: Sentýabr
Twi: Ewo
удмурт: Куарусён
українська: Вересень
اردو: ستمبر
ئۇيغۇرچە / Uyghurche: مىزان
Vahcuengh: 9 nyied
vèneto: Setenbre
vepsän kel’: Sügüz'ku
Tiếng Việt: Tháng chín
Volapük: Setul
Võro: Süküskuu
walon: Setimbe
West-Vlams: September
Winaray: Septyembre
Wolof: Satumbar
吴语: 9月
Xitsonga: Ndzhati
ייִדיש: סעפטעמבער
粵語: 9月
Zazaki: Keşkelun
žemaitėška: Siejė
中文: 9月
डोटेली: असोज
Bahasa Hulontalo: September
ГӀалгӀай: Михий бутт
Kabɩyɛ: Salaŋ fenaɣ