Sea temperature in Piraeus in December
The sea around Piraeus averages 18°C in December, usually between 17°C and 20°C. That is cold for most swimmers; a wetsuit helps.
Average18°CCool
Usual range17°C–20°C80% of readings
vs November−3.0°cooler
vs January−2.0°cooler next month
Through the year
Monthly averages 2023–2025. Water at 22°C or warmer: June–October.
December in recent years
| 2023 | 18°C |
|---|---|
| 2024 | 17°C |
| 2025 | 19°C |
Nearby in December
Beaches in Piraeus
104 of 104 beaches have an Excellent EU water-quality grade. See which ones are calm today.