Everything is open through the month, thinning from late September. The season proper runs to mid-October, so September sits comfortably inside it.
The bus holds its full-stretch timetable, every 15 minutes from roughly 07:00 to midnight, until early September, then eases. It does not drop back to every 30 minutes until 3 October.
Charter routes are still running, so getting here is straightforward. Tavernas, beach bars, sunbed operations, dive centres and boat trips are all trading, with the remote north-coast places the first to start closing at the end of the month.
7 September is the Katsonia commemoration. It marks the submarine Katsonis, sunk off Skiathos in September 1943, and locals throw flowers into the sea. We have one source for it.
The meltemi runs from June to September, so early September can still be windy. The rule holds: on a windy day go south, and book boat trips to Lalaria and the sea caves early in your stay.
Crowds: Busy early, quieter late. Prices: High early, falling late.
