Santorini Sea Temperature
Greece · Forecast updated Jul 15, 2026, 06:20 UTC
Current Sea Temperature
24.4°C
75.9°F
Mild water
Versus this month's average
Close to average
The July average in our archive is 24.4°C (75.9°F).
Recent trend
Warming by 0.3°C
Seven-day average: 24.6°C, versus 24.3°C in the prior seven days.
What to wear
Mild water
A rash guard is useful; cold-sensitive snorkelers may prefer a shorty wetsuit.
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 Santorini, monthly averages range from about 17.3°C (63.1°F) in March to 24.4°C (75.9°F) in July.
Over the past 30 days, the average sea temperature in Santorini has been 23.8°C.
Monthly Water Temperature Averages
| Month | Min | Average | Max |
|---|---|---|---|
| January | 17.5°C / 63.5°F | 18.2°C / 64.7°F | 19.0°C / 66.2°F |
| February | 17.2°C / 63.0°F | 17.5°C / 63.4°F | 17.8°C / 64.0°F |
| March | 17.1°C / 62.8°F | 17.3°C / 63.1°F | 17.8°C / 64.0°F |
| April | 17.1°C / 62.8°F | 17.6°C / 63.7°F | 19.2°C / 66.6°F |
| May | 17.6°C / 63.7°F | 19.4°C / 67.0°F | 22.2°C / 72.0°F |
| June | 21.3°C / 70.3°F | 22.8°C / 73.1°F | 24.3°C / 75.7°F |
| July | 23.8°C / 74.8°F | 24.4°C / 75.9°F | 25.6°C / 78.1°F |
| September | 23.5°C / 74.3°F | 24.2°C / 75.6°F | 25.2°C / 77.4°F |
| October | 22.0°C / 71.6°F | 22.5°C / 72.5°F | 24.3°C / 75.7°F |
| November | 20.2°C / 68.4°F | 21.3°C / 70.3°F | 22.1°C / 71.8°F |
| December | 19.0°C / 66.2°F | 19.7°C / 67.5°F | 20.5°C / 68.9°F |
Profile calculated from 7383 hourly forecast records across 11 monthly periods. This is a growing archive, not a long-term climate normal.
About the water at Santorini
Volcanic island with unique underwater landscapes
Santorini Water Temperature — Common Questions
What is the sea temperature in Santorini today?
The current sea surface temperature in Santorini is 24.4°C. Over the last 30 days, the average has been 23.8°C.
When is the water warmest in Santorini?
The warmest monthly average in the Santorini archive is July, at around 24.4°C (75.9°F).
When is the water coldest in Santorini?
The coldest monthly average in the archive is March, at around 17.3°C (63.1°F). A wetsuit is usually recommended during this period.
Can you swim in Santorini today?
Yes — at 24.4°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 Santorini.
View Snorkel Forecast →