Sea temperature in Kos in December
The sea around Kos averages 21°C in December, usually between 19°C and 22°C. That is cool: fine for a quick swim, many people find it chilly.
Average21°CCool
Usual range19°C–22°C80% of readings
vs November−1.8°cooler
vs January−1.3°cooler next month
Through the year
Monthly averages 2023–2025. Water at 22°C or warmer: June–November.
December in recent years
| 2023 | 21°C |
|---|---|
| 2024 | 20°C |
| 2025 | 21°C |
Nearby in December
Beaches in Kos
8 of 16 beaches have an Excellent EU water-quality grade. See which ones are calm today.