Sea temperature in Kos in August
The sea around Kos averages 26°C in August, usually between 25°C and 28°C. That is warm enough for most people to swim comfortably.
Average26°CWarm
Usual range25°C–28°C80% of readings
vs July+1.4°warmer
vs September−0.5°cooler next month
Through the year
Monthly averages 2023–2025. Water at 22°C or warmer: June–November.
August in recent years
| 2023 | 26°C |
|---|---|
| 2024 | 26°C |
| 2025 | 27°C |
Nearby in August
Beaches in Kos
15 of 16 beaches have an Excellent EU water-quality grade. See which ones are calm today.