Sea temperature in Skiathos in December
The sea around Skiathos averages 17°C in December, usually between 16°C and 18°C. That is cold for most swimmers; a wetsuit helps.
Average17°CCold
Usual range16°C–18°C80% of readings
vs November−2.6°cooler
vs January−1.6°cooler next month
Through the year
Monthly averages 2023–2025. Water at 22°C or warmer: June–October.
December in recent years
| 2023 | 17°C |
|---|---|
| 2024 | 17°C |
| 2025 | 18°C |
Nearby in December
Beaches in Skiathos
13 of 13 beaches have an Excellent EU water-quality grade. See which ones are calm today.