On the beach
Right now
Live conditions from Open-Meteo, refreshed hourly.
7-day outlook
7-day marine forecast from Open-Meteo.
Sea temperature
Next 7 days, °C
Wave height
Next 7 days, metres
View as table
| Day | Sea temp (°C) | Wave height (m) |
|---|---|---|
| Wed 2 | 26.1 | 0.7 |
| Thu 3 | 26.0 | 0.7 |
| Fri 4 | 25.8 | 0.8 |
| Sat 5 | 25.6 | 0.7 |
| Sun 6 | 25.9 | 0.3 |
| Mon 7 | 25.7 | 0.7 |
| Tue 8 | 25.5 | 0.9 |
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 | 16 |
| Apr | 18 |
| May | 21 |
| Jun | 24 |
| Jul | 26 |
| Aug | 27 |
| Sep | 26 |
| Oct | 24 |
| Nov | 21 |
| Dec | 18 |
Location & nearby beaches
Nearby beaches
- Agia Marina Chilistra1.0 kmAttica
- Porto Rafti1.3 kmAttica
- 1.4 km
- Avlaki2.9 kmAttica
Distances calculated as straight-line (haversine) from official coordinates.
Getting there & around
- By car: there's parking about ~520 m from the beach.
- Nearest bus stop is about ~140 m away.
Food, stays & town
- Nearest town: Λιμένας Μαρκόπουλου, about ~400 m away.
- 12 places to eat within 1 km Closest is Πόρτο Ράφτη, about ~90 m away.
- 2 places to stay mapped nearby Closest is Ι.Ν.Αγ.Νικολάου, about ~290 m away.
- 4 shops nearby, the closest about ~1.0 km away
What kind of beach is this?
This is a town beach, woven into the everyday fabric of a city or larger settlement — expect company on warm days, especially through July and August, alongside easy access to shops and services.
Estimated from OpenStreetMap surroundings data (ODbL).
Is the water clean at Kalos Gialos?
Kalos Gialos 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 Attica. There's parking about ~520 m from the beach.
That rating has been consistent: every one of the 11 classified seasons on record has come back Excellent or Good. The most reliable swimming window here typically runs from July–September, with the sea usually at its warmest around August. Outside that window the water is cooler and often quieter. It's been a consistently reliable spot too — the rating has held at Excellent for 11 straight years. The nearest town, Λιμένας Μαρκόπουλου, is about ~400 m away.
That “Excellent” label comes from a full season of official water sampling, not a single test — it's one step on a four-point scale (Excellent, Good, Sufficient, Poor) reassessed once a year. Today's actual conditions can differ from the seasonal average, so for a live snapshot see the “Right now” and 7-day outlook panels above. There are 12 places to eat within a kilometre — Πόρτο Ράφτη is the closest, about ~90 m away.
Frequently asked questions
Should you swim at Kalos Gialos?
Kalos Gialos is rated Excellent for 2025 — the top EU Bathing Water classification — with 11 of 11 classified seasons rating Excellent or Good, so yes. It's also held steady at Excellent for 11 straight years.
What's the current water temperature at Kalos Gialos?
The most recent reading for Kalos Gialos shows the sea at around 26°C. For live, up-to-the-hour conditions, see the “Right now” panel above. That's the reading right off Attica. On the modeled climatology here, August usually runs warmest.
When is the best time to swim at Kalos Gialos?
If you're planning around water temperature, July–September is the window to target — the modeled sea temperature is typically highest then. That applies to the water around Attica. Within that window, August is typically the single warmest month.
Who measures the water quality rating, and how?
It's based on official water samples: authorities test for intestinal enterococci and E. coli through the season, then report the full-season results to the European Environment Agency each spring, which assigns one of four grades — Excellent, Good, Sufficient or Poor. A few national authorities, including Croatia's IZOR, also publish individual samples during the season itself, ahead of that annual report — that isn't yet available for Kalos Gialos.
What's nearby Kalos Gialos — parking, buses, or a ferry?
By car, there's parking about ~520 m from the beach. There's a bus stop about ~140 m from the beach. The nearest town is Λιμένας Μαρκόπουλου, about ~400 m away.