Miscellanea
- In 1752, the British Empire adopted the Gregorian calendar. In the British Empire that year, September 2 was immediately followed by September 14.
- On Usenet, it is said that September 1993 (Eternal September) never ended.
- September in the Northern Hemisphere is the seasonal equivalent to March in the Southern Hemisphere and vice versa.
- The Ludi Magni (Ludi Romani) of classical Rome in honor of Jupiter, Juno and Minerva began on September 4.
- The principal ecclesiastical feasts falling within the month are: the Nativity of the Blessed Virgin on the 8th, the Exaltation of the Holy Cross on the 14th, St. Matthew the apostle on the 21st, and St. Michael the archangel on the 29th.
- September was called "harvest month" in Charlemagne's calendar.
- September corresponds partly to the Fructidor and partly to the Vendémiaire of the first French republic.
- The Anglo-Saxons called the month Gerstmonath, barley month, that crop being then usually harvested.
- September is called Herbstmonat, harvest month, in Switzerland.
- The September 11, 2001 attacks on the World Trade Center and the Pentagon.
- Prostate Cancer Awareness Month
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