Looking up...
Il mio compleanno è a settembre.
My birthday is in September.
The ninth month of the year in the Gregorian calendar.
A settembre le foglie iniziano a cambiare colore.
In September, the leaves start to change color.
La scuola ricomincia a settembre.
School resumes in September.
Settembre is derived from Latin 'September', originally the seventh month in the Roman calendar (from 'septem', meaning 'seven').
Italian months are not capitalized unless at the start of a sentence. The preposition 'a' is used for months (e.g., 'a settembre').
From Latin 'September', from 'septem' (seven), originally the seventh month in the Roman calendar (before January and February were added).
Used to refer to the month itself or events happening during it. Common in formal and informal contexts.