Sea temperature in Mykonos in September
The sea around Mykonos averages 24°C in September, usually between 23°C and 26°C. That is warm enough for most people to swim comfortably.
Average24°CWarm
Usual range23°C–26°C80% of readings
vs August−1.1°cooler
vs October−2.0°cooler next month
Through the year
Monthly averages 2023–2025. Water at 22°C or warmer: July–October.
September in recent years
| 2023 | 24°C |
|---|---|
| 2024 | 25°C |
| 2025 | 24°C |
Nearby in September
Beaches in Mykonos
11 of 11 beaches have an Excellent EU water-quality grade. See which ones are calm today.