Kefalonia Sea Temperature
Updated Sat 20:29 (Europe/Athens)
Greece · Forecast updated Aug 8, 2026, 20:29 UTC
Current Sea Temperature
28.0°C
82.4°F
Very warm water
Versus this month's average
0.4°C above
The August average in our archive is 27.6°C (81.7°F).
Recent trend
Warming by 0.4°C
Seven-day average: 27.4°C, versus 27.0°C in the prior seven days.
What to wear
Very warm water
Swimwear is usually enough; a rash guard adds sun protection.
Cold tolerance varies. Wind, session length, sunshine, and exertion also affect comfort; temperature alone does not describe sea conditions.
Sea Surface Temperature Over the Year
In the data collected for Kefalonia, monthly averages range from about 24.4°C (75.9°F) in June to 27.6°C (81.7°F) in August.
Over the past 30 days, the average sea temperature in Kefalonia has been 27.1°C.
Monthly Water Temperature Averages
| Month | Min | Average | Max |
|---|---|---|---|
| June | 21.1°C / 70.0°F | 24.4°C / 75.9°F | 27.5°C / 81.5°F |
| July | 25.4°C / 77.7°F | 26.8°C / 80.2°F | 28.8°C / 83.8°F |
| August | 27.0°C / 80.6°F | 27.6°C / 81.7°F | 28.9°C / 84.0°F |
Profile calculated from 1661 hourly forecast records across 3 monthly periods. This is a growing archive, not a long-term climate normal.
About the water at Kefalonia
Ionian island with the turquoise water of Myrtos and sheltered pebble coves.
- Area
- Ionian Islands
Kefalonia Water Temperature: Common Questions
What is the sea temperature in Kefalonia today?
The current sea surface temperature in Kefalonia is 28.0°C. Over the last 30 days, the average has been 27.1°C.
When is the water warmest in Kefalonia?
The warmest monthly average in the Kefalonia archive is August, at around 27.6°C (81.7°F).
When is the water coldest in Kefalonia?
The coldest monthly average in the archive is June, at around 24.4°C (75.9°F).
Can you swim in Kefalonia today?
At 28.0°C, the water is usually comfortable for swimming and snorkeling.
Full Snorkeling Forecast
See how today's sea temperature, wave height, wind, and tides combine into a detailed snorkeling score for Kefalonia.
View Snorkel Forecast →