Sea temperature in Piraeus in May
The sea around Piraeus averages 19°C in May, usually between 17°C and 21°C. That is cold for most swimmers; a wetsuit helps.
Average19°CCool
Usual range17°C–21°C80% of readings
vs April+1.9°warmer
vs June+4.4°warmer next month
Through the year
Monthly averages 2023–2025. Water at 22°C or warmer: June–October.
May in recent years
| 2023 | 19°C |
|---|---|
| 2024 | 19°C |
| 2025 | 19°C |
Nearby in May
Beaches in Piraeus
104 of 104 beaches have an Excellent EU water-quality grade. See which ones are calm today.