How to Say "september" in Spanish
The Spanish word for “september” is “septiembre” — A1 level. This is a very common word in everyday Spanish.

Examples
Mi cumpleaños es en septiembre.
My birthday is in September.
Las clases empiezan en septiembre en el hemisferio norte.
Classes start in September in the Northern Hemisphere.
Septiembre es el mes de la primavera en Argentina.
September is the month of spring in Argentina.
Using 'en' with months
To say something happens 'in September,' use the word 'en' (in/on): 'Viajo en septiembre.' (I travel in September.)
Capitalization Error
Mistake: “Using a capital 'S' (Septiembre) in the middle of a sentence.”
Correction: In Spanish, the names of the months are usually written with a lowercase letter: 'Viajo en septiembre.' (I travel in September.)
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