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"The weather beyond the train windows was as patchy as it had been all summer; they passed through stretches of the chilling mist, then out into weak, clear sunlight."
September is the ninth month of the year. It's one of the months of the year with thirty days. The Hogwarts school year starts during this month.

Notable events

Date Year Events
1 September 1991
"Hmm. Difficult. Very difficult. Plenty of courage, I see. Not a bad mind either. There's talent, oh my goodness, yes — and a nice thirst to prove yourself, now that's interesting... So where shall I put you?"
—The Sorting Hat Sorting Harry Potter[src]
Pottermore background the sorting ceremony
Harry Potter and his classmates are sorted into their Hogwarts houses. The trio are Sorted into Gryffindor House and Draco Malfoy into Slytherin House.
19 September 1979 Hermione Granger is born to Mr and Mrs Granger.
25 September pre 1919 Garrick Ollivander is born.
26 September unknown Quirinus Quirrell is born.

Notable dates