Sea temperature in Mykonos in December
The sea around Mykonos averages 18°C in December, usually between 17°C and 19°C. That is cold for most swimmers; a wetsuit helps.
Average18°CCold
Usual range17°C–19°C80% of readings
vs November−2.2°cooler
vs January−1.0°cooler next month
Through the year
Monthly averages 2023–2025. Water at 22°C or warmer: July–October.
December in recent years
| 2023 | 18°C |
|---|---|
| 2024 | 17°C |
| 2025 | 18°C |
Nearby in December
Beaches in Mykonos
11 of 11 beaches have an Excellent EU water-quality grade. See which ones are calm today.