Climate
In mid-September, daytime air temperatures in Sochi average around +23°C. In sunny coastal areas, it can warm up to +27°C, while in the mountains and in the evenings it drops to +15°C. The sea water is still warm, though not as warm as in August. Rainfall is possible but generally short-lived.
It’s best to dress with temperature changes throughout the day in mind. Bring T-shirts, a light sweater or cardigan, and a windbreaker for evening walks. Closed-toe shoes are a good choice in case of rain. The sun is still quite active in September, so sunglasses and sunscreen are useful.