Kefalonia Sea Temperature
Greece · Forecast updated Jul 15, 2026, 06:22 UTC
Current Sea Temperature
26.2°C
79.2°F
Warm water
Versus this month's average
Close to average
The July average in our archive is 26.4°C (79.5°F).
Recent trend
Holding fairly steady
Seven-day average: 26.3°C, versus 26.4°C in the prior seven days.
What to wear
Warm water
Most people are comfortable in swimwear or a light rash guard.
Cold tolerance varies. Wind, session length, sunshine, and exertion also affect comfort; temperature alone does not mean the sea is safe.
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 26.4°C (79.5°F) in July.
Over the past 30 days, the average sea temperature in Kefalonia has been 25.9°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 | 26.4°C / 79.5°F | 27.7°C / 81.9°F |
Profile calculated from 1071 hourly forecast records across 2 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 26.2°C. Over the last 30 days, the average has been 25.9°C.
When is the water warmest in Kefalonia?
The warmest monthly average in the Kefalonia archive is July, at around 26.4°C (79.5°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?
Yes — at 26.2°C the water is warm enough for comfortable 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 →