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 | 28.8 | 0.2 |
| Thu 3 | 28.1 | 0.2 |
| Fri 4 | 27.9 | 0.1 |
| Sat 5 | 27.7 | 0.0 |
| Sun 6 | 28.0 | 0.0 |
| Mon 7 | 28.4 | 0.3 |
| Tue 8 | 27.9 | 0.2 |
Water quality history
Official EEA classification, one rating per bathing season, 2015–2025 — real data reported by national authorities.
- 2015: Not classified2015
- 2016: Not classified2016
- 2017: Not classified2017
- 2018: Not classified2018
- 2019: Not classified2019
- 2020: Not classified2020
- 2021: Not classified2021
- 2022: Not classified2022
- 2023: Excellent2023
- 2024: Excellent2024
- 2025: Excellent2025
Excellent in the most recent season, and 3 of 3 classified years rated Excellent or Good.
- Excellent
- Good
- Sufficient
- Poor
- Not classified
View as table
| Year | Classification |
|---|---|
| 2015 | Not classified |
| 2016 | Not classified |
| 2017 | Not classified |
| 2018 | Not classified |
| 2019 | Not classified |
| 2020 | Not classified |
| 2021 | Not classified |
| 2022 | Not classified |
| 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
Getting there & around
- By car: there's parking about ~1.0 km from the beach.
- Nearest bus stop is about ~1.3 km away.
Food, stays & town
- Nearest city: Κόρινθος, about ~2.8 km away.
- 3 places to eat within 1 km Closest is Rose Blossom, about ~460 m away.
- 1 shop nearby, about ~1.0 km away
What kind of beach is this?
This beach belongs to a small coastal village. It's usually calmer than a resort or town beach, though a popular village spot can still fill up on the best summer days.
Estimated from OpenStreetMap surroundings data (ODbL).
Is the water clean at Poseidonia?
Poseidonia is a coastal bathing site with an official EU Bathing Water rating of Excellent for the 2025 season — the highest official classification under the EU bathing-water assessment. That annual classification comes from the EU Bathing Water Directive: national authorities test for two indicator bacteria, intestinal enterococci and E. coli, throughout the bathing season, then report the full-season results to the European Environment Agency (EEA) the following spring — the 2025 season's rating was published in spring 2026, and the 2026 season won't be rated 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. You can park about ~1.0 km away.
That rating has been consistent: every one of the 3 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 3 straight years. Κόρινθος — the closest town — sits about ~2.8 km from here.
Worth remembering: “Excellent” isn't a live reading, it's an annual grade — Excellent, Good, Sufficient or Poor — set once a year from that season's water samples and describing the average, not this afternoon's conditions. For what the sea is doing right now, check the “Right now” panel and 7-day outlook above. It sits in Peloponnese. There are 3 places to eat within a kilometre — Rose Blossom is the closest, about ~460 m away.
Frequently asked questions
Can you safely swim at Poseidonia?
It's about as safe as bathing water gets: Poseidonia's 2025 EU rating is Excellent, the top tier on the scale, and 3 of 3 classified seasons have come back Excellent or Good. It's also held steady at Excellent for 3 straight years.
Is the sea warm at Poseidonia today?
As of the latest update, the sea temperature at Poseidonia is around 28°C — see the “Right now” panel above for live conditions. That's the reading right off Peloponnese.
Which month has the warmest sea at Poseidonia?
July–September tends to be the sweet spot for swimming here, with sea temperatures usually peaking later in that stretch. That applies to the water around Peloponnese.
How is the water quality rating measured?
The grade comes from a full season of official sampling for intestinal enterococci and E. coli, reported to the European Environment Agency each spring under the EU Bathing Water Directive, which assigns Excellent, Good, Sufficient or Poor. Some countries (Croatia, via IZOR) also publish individual in-season samples ahead of that report; Poseidonia doesn't have that feed yet.
Can you drive to Poseidonia?
By car, there's parking about ~1.0 km from the beach. There's a bus stop about ~1.3 km from the beach. The nearest town is Κόρινθος, about ~2.8 km away.