On the beach
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 | 27.6 | 0.6 |
| Thu 3 | 28.0 | 0.6 |
| Fri 4 | 27.9 | 0.6 |
| Sat 5 | 27.4 | 0.6 |
| Sun 6 | 27.0 | 0.6 |
| Mon 7 | 26.8 | 0.6 |
| Tue 8 | 27.1 | 0.6 |
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: Good2019
- 2020: Good2020
- 2021: Good2021
- 2022: Good2022
- 2023: Sufficient2023
- 2024: Sufficient2024
- 2025: Sufficient2025
Sufficient in the most recent season, and 8 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 | Good |
| 2020 | Good |
| 2021 | Good |
| 2022 | Good |
| 2023 | Sufficient |
| 2024 | Sufficient |
| 2025 | Sufficient |
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 | 15 |
| Feb | 14 |
| Mar | 15 |
| Apr | 16 |
| May | 19 |
| Jun | 21 |
| Jul | 23 |
| Aug | 24 |
| Sep | 23 |
| Oct | 22 |
| Nov | 19 |
| Dec | 17 |
Location & nearby beaches
Nearby beaches
- La Fresnaye1.2 kmCôtes-d'Armor
- Pissotte1.8 kmCôtes-d'Armor
- Chateau Serein2.0 kmCôtes-d'Armor
- La Grande Plage2.4 kmCôtes-d'Armor
Distances calculated as straight-line (haversine) from official coordinates.
Getting there & around
- Easy by car — there's parking close to the beach.
Food, stays & town
- Nearest village: Saint-Cast-le-Guildo, about ~2.0 km away.
- 3 places to stay mapped nearby Closest is Camping de la Fontaine, about ~620 m 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 La Fosse?
Thinking of swimming at La Fosse? The short answer: its official EU Bathing Water rating for 2025 is Sufficient — meets the minimum EU standard in the latest annual assessment. That rating is set once a year under the EU Bathing Water Directive, from a full season of testing for intestinal enterococci and E. coli reported to the European Environment Agency the following spring, so the 2025 season's grade appeared in spring 2026 and the 2026 season won't be graded 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's been a consistently reliable spot too — the rating has held at Sufficient for 3 straight years. There's parking about ~170 m from the beach.
Over the 11 classified seasons on record, 8 have come back Excellent or Good — a track record worth checking each year rather than assuming. 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, Saint-Cast-le-Guildo, is about ~2.0 km away.
“Sufficient” 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.
Frequently asked questions
Is La Fosse safe to swim in?
It passes, barely: La Fosse's official 2025 classification is Sufficient, the minimum passing grade, so a quick check of posted advisories is worthwhile before you swim.
What is the sea temperature at La Fosse today?
For La Fosse, the ~27°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 Côtes-d'Armor. On the modeled climatology here, August usually runs warmest.
When should you plan a swimming trip to La Fosse?
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 Côtes-d'Armor. Within that window, August is typically the single warmest month.
Who measures the water quality rating, and how?
Behind the annual grade: a season of testing for intestinal enterococci and E. coli, reported to the European Environment Agency each spring under the EU Bathing Water Directive. A few countries, Croatia via IZOR included, also publish individual in-season samples ahead of that report, but La Fosse doesn't have one published yet.
Is there parking near La Fosse?
By car, it's easy — parking is right by the beach. The nearest town is Saint-Cast-le-Guildo, about ~2.0 km away.