France · Ille-et-Vilaine
Le Sillon
Ille-et-Vilaine, France
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 | 21.6 | 0.6 |
| Thu 3 | 21.5 | 0.6 |
| Fri 4 | 21.4 | 0.9 |
| Sat 5 | 21.6 | 0.6 |
| Sun 6 | 21.6 | 0.6 |
| Mon 7 | 21.6 | 0.6 |
| Tue 8 | 21.4 | 1.3 |
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: Good2023
- 2024: Good2024
- 2025: Good2025
Good 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 | Good |
| 2024 | Good |
| 2025 | Good |
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 Hoguette145 mIlle-et-Vilaine
- Rochebonne905 mIlle-et-Vilaine
- Le Minihic1.5 kmIlle-et-Vilaine
- L'Eventail1.8 kmIlle-et-Vilaine
Distances calculated as straight-line (haversine) from official coordinates.
Getting there & around
- By car: there's parking about ~610 m from the beach.
- Bus stop: Courtoisville, about ~220 m away.
Food, stays & town
- Nearest town: Saint-Malo, about ~2.1 km away.
- 19 places to eat within 1 km Closest is Bar La Passerelle, about ~70 m away.
- 16 places to stay mapped nearby Closest is Le Grand Hôtel des Thermes, about ~70 m away.
- 4 shops nearby, the closest about ~310 m away
What kind of beach is this?
This beach sits in a built-up resort setting, with hotels, restaurants and services clustered around it — a full-service stretch of coast that tends to be busy in peak season and quieter outside it.
Estimated from OpenStreetMap surroundings data (ODbL).
- Families
- Full-service days
Is the water clean at Le Sillon?
Le Sillon sits on a stretch of coast classed as a coastal bathing site, carrying an official EU Bathing Water rating of Good 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 Ille-et-Vilaine. You can park about ~610 m away.
Looking to avoid the busiest weeks? The water is typically warmest around August, with the most reliable swimming window running July–September; outside that stretch you'll find a cooler sea but a quieter beach. That rating has been consistent: every one of the 11 classified seasons on record has come back Excellent or Good. On site you'll find Toilets, Beach bar, and Restaurant. Saint-Malo — the closest town — sits about ~2.1 km from here.
“Good” 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 are 19 places to eat within a kilometre — Bar La Passerelle is the closest, about ~70 m away.
Frequently asked questions
Can you safely swim at Le Sillon?
It's a solid yes: Le Sillon is rated Good for 2025, the second tier on the EU scale, backed by 11 of 11 classified seasons at Excellent or Good. It's also held steady at Good for 3 straight years.
How warm is the sea at Le Sillon right now?
Right now, the sea at Le Sillon is measuring around 21°C; see the “Right now” panel above for the latest conditions. That's the reading right off Ille-et-Vilaine.
Which month has the warmest sea at Le Sillon?
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 Ille-et-Vilaine.
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; Le Sillon doesn't have that feed yet.
How do I get to Le Sillon without a car?
By car, there's parking about ~610 m from the beach. By bus, the nearest stop is Courtoisville, about ~220 m away. The nearest town is Saint-Malo, about ~2.1 km away.