Short answer: yes — probably the best month. Long answer: it depends what you seek. Here are the honest facts from people who live here year-round.
What you gain
A very warm sea without crowds, finally-cool trails, front-row sunsets everywhere, low-season prices with high-season services: cove boats run regularly until early October, and restaurants breathe — you book same-day.
What to know
Days shorten (sunset around 7:15pm mid-month) and some beach kiosks close after the 20th. The mistral may bring two-three windy days: perfect for Gorropu, Ulassai or the wineries, less so for boats. Keep a plan B ready — it is often better than plan A.
The verdict
For couples, photographers, hikers and anyone free of the school calendar, September in Ogliastra simply beats August: same light, half the people, "occasione" prices. Our rooms start at €80 — the right moment of the right year.