Right now
Sample dataIllustrative conditions — the live Open-Meteo marine feed wasn't reachable, so these are deterministic placeholder values that will be replaced automatically once the feed is available.
7-day outlook
Sample dataModeled placeholder forecast for demonstration — will be replaced by a live marine-weather feed.
Sea temperature
Next 7 days, °C
Wave height
Next 7 days, metres
View as table
| Day | Sea temp (°C) | Wave height (m) |
|---|---|---|
| Wed 2 | 25.9 | 0.3 |
| Thu 3 | 26.2 | 0.3 |
| Fri 4 | 26.1 | 0.3 |
| Sat 5 | 25.7 | 0.3 |
| Sun 6 | 25.2 | 0.3 |
| Mon 7 | 25.0 | 0.3 |
| Tue 8 | 25.3 | 0.3 |
Water quality history
Official EEA classification, one rating per bathing season, 2015–2025 — real data reported by national authorities.
- 2015: Excellent2015
- 2016: Excellent2016
- 2017: Excellent2017
- 2018: Excellent2018
- 2019: Excellent2019
- 2020: Excellent2020
- 2021: Excellent2021
- 2022: Excellent2022
- 2023: Excellent2023
- 2024: Excellent2024
- 2025: Excellent2025
Excellent in the most recent season, and 11 of 11 classified years rated Excellent or Good.
- Excellent
- Good
- Sufficient
- Poor
- Not classified
View as table
| Year | Classification |
|---|---|
| 2015 | Excellent |
| 2016 | Excellent |
| 2017 | Excellent |
| 2018 | Excellent |
| 2019 | Excellent |
| 2020 | Excellent |
| 2021 | Excellent |
| 2022 | Excellent |
| 2023 | Excellent |
| 2024 | Excellent |
| 2025 | Excellent |
Typical sea temperature by month
Modeled estimatePlausible seasonal climatology derived from latitude, for illustration — not a measured average.
Monthly sea temperature
Typical range across the year, °C
View as table
| Month | Typical sea temp (°C) |
|---|---|
| Jan | 16 |
| Feb | 16 |
| Mar | 17 |
| Apr | 19 |
| May | 21 |
| Jun | 24 |
| Jul | 26 |
| Aug | 27 |
| Sep | 26 |
| Oct | 24 |
| Nov | 21 |
| Dec | 18 |
Location & nearby beaches
Nearby beaches
- Chinitsa1.7 kmPeloponnese
- Limanakia2.2 kmPeloponnese
- Anargyrios Scholi2.7 kmAttica
- Ligoneri3.1 kmAttica
Distances calculated as straight-line (haversine) from official coordinates.
Getting there & around
- By car: there's parking about ~380 m from the beach.
- Nearest ferry landing is about ~420 m away.
Food, stays & town
- Nearest town: Σπέτσες, about ~3.4 km away.
- 1 place to eat within 1 km Closest is Ακρογιάλι, about ~350 m away.
- 1 place to stay mapped nearby
What kind of beach is this?
With no facilities mapped nearby, this beach is usually on the quiet side even in season — worth knowing if you're after solitude, but also worth bringing your own water and shade.
Estimated from OpenStreetMap surroundings data (ODbL).
- A quiet swim
Is the water clean at Kosta?
Kosta sits on a stretch of coast classed as a coastal bathing site, carrying an official EU Bathing Water rating of Excellent for the 2025 season. Under the EU Bathing Water Directive, national authorities test for intestinal enterococci and E. coli through the season and report the results the following spring — the 2025 rating was published in spring 2026, and 2026's won't follow until spring 2027. In addition to that yearly rating, some national authorities — for Croatia, the national environmental authority — publish individual water sample results during the season itself, ahead of the annual report. It sits in Peloponnese. There's parking about ~380 m from the beach.
That rating has been consistent: every one of the 11 classified seasons on record has come back Excellent or Good. If you're timing a visit around water temperature rather than crowds, July–September is the safest bet, with August typically the peak — expect a cooler, calmer sea either side of that stretch. The nearest town, Σπέτσες, is about ~3.4 km away.
“Excellent” is one point on a four-step scale — Excellent, Good, Sufficient or Poor — assigned once per year from that season's water samples, not a live reading. It describes how the site performs on average across the season, not the exact water quality this afternoon; for day-to-day sea conditions, see the “Right now” and 7-day outlook panels above. There's 1 place to eat near the beach — Ακρογιάλι, about ~350 m away.
Frequently asked questions
Should you swim at Kosta?
Yes, without much reservation. Kosta holds the top EU Bathing Water classification, Excellent, for 2025, and 11 of 11 classified seasons here have rated Excellent or Good. It's also held steady at Excellent for 11 straight years.
What's the current water temperature at Kosta?
For Kosta, the ~26°C figure above is a stand-in value, not a live reading — the marine-weather feed was unreachable when the page last built, and it'll swap in automatically once the feed responds again. That's the reading right off Peloponnese. On the modeled climatology here, August usually runs warmest.
When should you plan a swimming trip to Kosta?
For swimming, July–September is usually the best call — that's the modeled window when the sea here runs warmest. That applies to the water around Peloponnese. Within that window, August is typically the single warmest month.
Who measures the water quality rating, and how?
Once a year, national authorities report a full season of testing for intestinal enterococci and E. coli to the European Environment Agency, which grades the season Excellent, Good, Sufficient or Poor under the EU Bathing Water Directive. A handful of countries, including Croatia via IZOR, also publish individual in-season samples ahead of that report — Kosta doesn't have that feed set up yet.
What's the easiest way to reach Kosta?
By car, there's parking about ~380 m from the beach. There's a ferry landing about ~420 m from the beach. The nearest town is Σπέτσες, about ~3.4 km away.