The query "September when" seems most naturally interpreted as a question about when the month of September occurs. September is the ninth month of the year in the Gregorian calendar, following August and preceding October. It has 30 days and marks the beginning of autumn in the Northern Hemisphere and spring in the Southern Hemisphere. If the user intended a different specific meaning or context by "September when," such as an event, music group, or other topic related to "September," additional clarification would be needed. There is information available about "The September When," a Norwegian rock band, but it does not seem directly related to the question of when September is. To summarize, September is the ninth month of the calendar year occurring annually from September 1 to September 30. Let me know if the interest is in a different context regarding "September when."
