France · Loire-Atlantique
Le Castouillet (Baie)
Loire-Atlantique, France
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 | 25.2 | 0.5 |
| Thu 3 | 24.7 | 0.5 |
| Fri 4 | 24.3 | 0.5 |
| Sat 5 | 24.4 | 0.5 |
| Sun 6 | 24.8 | 0.5 |
| Mon 7 | 25.3 | 0.5 |
| Tue 8 | 25.5 | 0.5 |
Water quality history
Official EEA classification, one rating per bathing season, 2015–2025 — real data reported by national authorities.
- 2015: Good2015
- 2016: Excellent2016
- 2017: Excellent2017
- 2018: Excellent2018
- 2019: Excellent2019
- 2020: Good2020
- 2021: Good2021
- 2022: Good2022
- 2023: Sufficient2023
- 2024: Poor2024
- 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 | Good |
| 2016 | Excellent |
| 2017 | Excellent |
| 2018 | Excellent |
| 2019 | Excellent |
| 2020 | Good |
| 2021 | Good |
| 2022 | Good |
| 2023 | Sufficient |
| 2024 | Poor |
| 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 | 17 |
| May | 19 |
| Jun | 22 |
| Jul | 23 |
| Aug | 24 |
| Sep | 24 |
| Oct | 22 |
| Nov | 20 |
| Dec | 17 |
Location & nearby beaches
Nearby beaches
- Port Aux Rocs845 mLoire-Atlantique
- Saint Jean de Dieu1.1 kmLoire-Atlantique
- Les Sables Menus1.8 kmLoire-Atlantique
- Port Lin2.6 kmLoire-Atlantique
Distances calculated as straight-line (haversine) from official coordinates.
Getting there & around
- Easy by car — there's parking close to the beach.
- Bus stop: Castouillet, about ~210 m away.
Food, stays & town
- Nearest village: Le Croisic, about ~2.3 km away.
- 3 places to eat within 1 km Closest is Le Bac à Sable, about ~160 m away.
- 5 places to stay mapped nearby Closest is Hôtel Castel Moor, about ~320 m away.
- 1 shop nearby, about ~350 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 Le Castouillet (Baie)?
Le Castouillet (Baie) is a coastal bathing site with an official EU Bathing Water rating of Sufficient for the 2025 season — meets the minimum EU standard in the latest annual 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. On site you'll find Sandy shore, Toilets, and Restaurant. You can park about ~180 m away.
Over the 11 classified seasons on record, 8 have come back Excellent or Good — a track record worth checking each year rather than assuming. 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. Water quality here has been improving: the rating moved from Poor to Sufficient in 2025. Le Croisic — the closest town — sits about ~2.3 km from here.
Worth remembering: “Sufficient” 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 Loire-Atlantique. There are 3 places to eat within a kilometre — Le Bac à Sable is the closest, about ~160 m away.
Frequently asked questions
Is Le Castouillet (Baie) a safe beach for swimming?
Generally yes, but with caution. Its official 2025 rating is Sufficient — the minimum passing grade — so check for posted local advisories before swimming.
How warm is the sea at Le Castouillet (Baie) right now?
That's placeholder data, not a live measurement: Le Castouillet (Baie)'s marine-weather feed couldn't be reached, so the panel above is showing an estimated ~25°C until the real feed comes back. That's the reading right off Loire-Atlantique.
Which month has the warmest sea at Le Castouillet (Baie)?
July–September is typically the most reliable swimming window, with the sea usually warmest in the second half of summer. That applies to the water around Loire-Atlantique.
How is the water quality rating measured?
The annual classification — Excellent, Good, Sufficient or Poor — is built from a full season of official testing for intestinal enterococci and E. coli, reported to the European Environment Agency each spring. Some national authorities (Croatia's IZOR among them) also publish individual samples during the season itself; Le Castouillet (Baie) isn't yet covered by that in-season feed.
How do you get to Le Castouillet (Baie)?
By car, it's easy — parking is right by the beach. By bus, the nearest stop is Castouillet, about ~210 m away. The nearest town is Le Croisic, about ~2.3 km away.