Sea temperature in Kos in April
The sea around Kos averages 18°C in April, 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 March+0.5°warmer
vs May+1.5°warmer next month
Through the year
Monthly averages 2023–2025. Water at 22°C or warmer: June–November.
April in recent years
| 2023 | 17°C |
|---|---|
| 2024 | 19°C |
| 2025 | 18°C |
Nearby in April
Beaches in Kos
15 of 16 beaches have an Excellent EU water-quality grade. See which ones are calm today.