Kos Sea Temperature
Updated Sun 01:38 (Europe/Athens)
Greece · Forecast updated Aug 9, 2026, 01:38 UTC
Current Sea Temperature
26.9°C
80.4°F
Warm water
Versus this month's average
Close to average
The August average in our archive is 27.1°C (80.9°F).
Recent trend
Warming by 2.1°C
Seven-day average: 26.9°C, versus 24.8°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 describe sea conditions.
Sea Surface Temperature Over the Year
In the data collected for Kos, monthly averages range from about 23.8°C (74.9°F) in June to 27.1°C (80.9°F) in August.
Over the past 30 days, the average sea temperature in Kos has been 25.5°C.
Monthly Water Temperature Averages
| Month | Min | Average | Max |
|---|---|---|---|
| June | 21.6°C / 70.9°F | 23.8°C / 74.9°F | 26.7°C / 80.1°F |
| July | 23.9°C / 75.0°F | 24.9°C / 76.8°F | 27.5°C / 81.5°F |
| August | 25.2°C / 77.4°F | 27.1°C / 80.9°F | 28.8°C / 83.8°F |
Profile calculated from 1665 hourly forecast records across 3 monthly periods. This is a growing archive, not a long-term climate normal.
About the water at Kos
Dodecanese island with calm bays and clear shallows along long beaches.
- Area
- Dodecanese
Kos Water Temperature: Common Questions
What is the sea temperature in Kos today?
The current sea surface temperature in Kos is 26.9°C. Over the last 30 days, the average has been 25.5°C.
When is the water warmest in Kos?
The warmest monthly average in the Kos archive is August, at around 27.1°C (80.9°F).
When is the water coldest in Kos?
The coldest monthly average in the archive is June, at around 23.8°C (74.9°F).
Can you swim in Kos today?
At 26.9°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 Kos.
View Snorkel Forecast →