Sea temperature in Kefalonia in August
The sea around Kefalonia averages 27°C in August, usually between 25°C and 29°C. That is warm enough for most people to swim comfortably.
Average27°CWarm
Usual range25°C–29°C80% of readings
vs July+0.4°warmer
vs September−0.9°cooler next month
Through the year
Monthly averages 2023–2025. Water at 22°C or warmer: June–October.
August in recent years
| 2023 | 26°C |
|---|---|
| 2024 | 29°C |
| 2025 | 26°C |
Nearby in August
Beaches in Kefalonia
34 of 34 beaches have an Excellent EU water-quality grade. See which ones are calm today.