September
Americannoun
noun
Usage
What is September? September is the ninth month of the year in the Gregorian calendar. It has 30 days and is between August and October. In the Northern Hemisphere, September is known as the first month of the autumn season, while in the Southern Hemisphere, it’s the first month of the spring season. Much of the world celebrates International Workers Day in May, but in the United States and Canada, a similar celebration, called Labor Day, is held. It is celebrated on the first Monday of September. The Jewish holiday Rosh Hashanah, which marks the beginning of the year, is normally held in September. The holiday’s exact date changes because it is set according to the Hebrew calendar, which is based on the Moon’s cycle. Example: For many people, September is a calm month before the holidays in October, November, and December.
Other Word Forms
Etymology
Origin of September
First recorded before 1050; Middle English Septembre, Old English, from Latin September “seventh month” in the early Roman calendar; for formation see December
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
Jay Hatfield, chief executive at Infrastructure Capital Advisors, pointed to overall seasonal risks, noting that May and September have historically been weaker months for stocks.
From MarketWatch • May 23, 2026
Jay Hatfield, chief executive at Infrastructure Capital Advisors, pointed to overall seasonal risks, noting that May and September have historically been weaker months for stocks.
From MarketWatch • May 23, 2026
Two hours away in Ringwood, Hampshire, Marie and Simon Dunning are grieving for their son Matthew who died suddenly and unexpectedly in September 2025.
From BBC • May 22, 2026
That would mark the highest reading since September 2024.
From The Wall Street Journal • May 22, 2026
One further note: The sled dogs came back from the glacier in late September, still before snow, and moved in and peed in their circles and in a wonderful way changed the dynamic of everything.
From This Side of Wild by Gary Paulsen
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
