Agios Stefanos Kos — Sea temperature now
Kos family beach.
Warm water with a light chop and a light breeze — great swimming conditions.
Location
Agios Stefanos Kos on the map, with nearby beaches and live sea temperatures.
7-day forecast
Water, air, waves, wind and UV outlook for the week ahead.
Monthly sea temperature averages
Typical year-round water temperature, based on regional climatology.
Best time to swim in Agios Stefanos Kos
The sea in Agios Stefanos Kos peaks in August, when the water averages around 26°C.
The main swimming season runs from May – November, when surface temperatures stay comfortable for extended sessions.
On average, 7 months a year sit above 20°C — the threshold most swimmers describe as pleasant without a wetsuit.
Shoulder months like April and December are noticeably cooler but often quieter, with fewer crowds and steadier weather.
Outside peak season the water drops toward 17°C, so a 3/2mm shorty or full wetsuit makes long swims much more comfortable.
The coldest month is typically February at around 15°C, when cold-water swimmers dominate the coast.
Agios Stefanos Kos sea temperature history
Long-term climatology for Agios Stefanos Kos shows an annual mean sea temperature of 20°C, ranging from 15°C in winter to 26°C at the summer peak.
The seasonal swing is roughly 11°C between the coldest and warmest month — a useful yardstick when comparing years or checking whether the current sea is running above or below average.
Recent decades have trended slightly warmer at Agios Stefanos Kos, in line with regional sea-surface temperature records for the wider basin.
Monthly averages below are drawn from multi-decadal climatology and are updated as new observations arrive.
Agios Stefanos Kos sea temperature: frequently asked questions
What is the warmest month to swim in Agios Stefanos Kos?
August is the warmest month in Agios Stefanos Kos, when the sea averages about 26°C. Late-season warmth often persists a few weeks after peak.
When is the sea coldest in Agios Stefanos Kos?
The coldest month in Agios Stefanos Kos is typically February, when the water averages around 15°C. Cold-water swimmers and surfers dominate this period.
When can you swim in Agios Stefanos Kos without a wetsuit?
The main swimming season in Agios Stefanos Kos runs from May – November — about 7 months a year when the sea sits above 20°C, the level most swimmers describe as pleasant without a wetsuit.
Do I need a wetsuit in Agios Stefanos Kos?
Outside peak summer the water in Agios Stefanos Kos drops toward 17°C, so a 3/2mm shorty or full wetsuit makes long swims much more comfortable. In peak months most swimmers go without.
What is the average sea temperature in Agios Stefanos Kos?
The long-term annual mean sea temperature in Agios Stefanos Kos is about 20°C, based on multi-decadal climatology of the surrounding waters.
How do I check the current sea temperature in Agios Stefanos Kos?
The live reading at the top of this page shows the current sea temperature in Agios Stefanos Kos, updated hourly from marine buoy and satellite data. The 7-day forecast covers water, air, waves, wind and UV for the week ahead.
Year-round sea temperature
Best swim months: May – Jun – Jul – Aug – Sep – Oct – Nov
| Month | Sea | Comfort |
|---|---|---|
| Jan | 16°C | Bracing |
| Feb | 15°C | Bracing |
| Mar | 15°C | Bracing |
| Apr | 17°C | Bracing |
| May | 20°C | Pleasant |
| Jun | 23°C | Warm |
| Jul | 25°C | Warm |
| Aug ⭐ | 26°C | Hot |
| Sep | 25°C | Warm |
| Oct | 22°C | Warm |
| Nov | 20°C | Pleasant |
| Dec | 17°C | Bracing |