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September is the ninth month of the year in both the Gregorian calendar and the less commonly used Julian calendar. In the modern Gregorian calendar, its length is 30 days. September in the Northern Hemisphere and March in the Southern Hemisphere are seasonally equivalent.
Learn about the origin, meaning, and significance of September, the ninth month of the year. Find out about its holidays, astronomical events, birthstone, birth flowers, and zodiac signs.
September, ninth month of the Gregorian calendar. Its name is derived from septem , Latin for “ seven ,” an indication of its position in the early Roman calendar . This article was most recently revised and updated by Adam Augustyn .
- The Editors of Encyclopaedia Britannica
- The Month of September. September’s name comes from the Latin word septem, meaning “seven.” This month had originally been the seventh month of the early Roman calendar.
- September Calendar. September 4—the first Monday of the month—is Labor Day. Canadians also observe Labour Day. September 11 is Patriot Day, held in honor and remembrance of those who died in the September 11, 2001 terrorist attacks.
- Holiday Traditions Around the World. Also known as the Moon Festival, this holiday has been celebrated for at least 3,000 years and is said to be the second-largest festival in China after the Chinese New Year.
- September Astronomy. Full Harvest Moon. September’s full moon, the Harvest Moon, reaches peak illumination on Friday, September 19, at 5:58 A.M. EDT. Read more about September’s Full Moon!
- On the Calendar. The name September comes from the Latin septem, meaning seven, since it was the seventh month of the Roman calendar, which began with March.
- Birth Month. September has three birth flowers: the forget-me-not, the morning glory, and the aster. Forget-me-nots represent love and memories, asters represent love as well, and the morning glory represents unrequited love.
- Holidays. September has several United States and international holidays. Labor Day is the most well known holiday in September. It is observed every year on the first Monday in September.
- Fun Days. There are lots of days dedicated to fun activities in September. Look out for these days. September 5th: National Cheese Pizza Day. September 9th: National Teddy Bear Day.
September (Sep.) is the ninth 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.)
United States September 2022 – Calendar with American holidays. Monthly calendar for the month September in year 2022. Calendars – online and print friendly – for any year and month.
