France · Sarthe
Lac de Sille Le Guillaume
Sarthe, 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 | 27.3 | 0.8 |
| Thu 3 | 26.8 | 0.8 |
| Fri 4 | 26.5 | 0.8 |
| Sat 5 | 26.6 | 0.8 |
| Sun 6 | 27.0 | 0.8 |
| Mon 7 | 27.5 | 0.8 |
| Tue 8 | 27.6 | 0.8 |
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: Good2021
- 2022: Good2022
- 2023: Excellent2023
- 2024: Good2024
- 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 | Good |
| 2022 | Good |
| 2023 | Excellent |
| 2024 | Good |
| 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 | 15 |
| Feb | 14 |
| Mar | 15 |
| Apr | 17 |
| May | 19 |
| Jun | 22 |
| Jul | 24 |
| Aug | 25 |
| Sep | 24 |
| Oct | 22 |
| Nov | 19 |
| Dec | 17 |
Location & nearby beaches
Nearby beaches
- Le Gue de Selle22 kmMayenne
- Plan D'Eau de Brulon29 kmSarthe
- 33 km
- 38 km
Distances calculated as straight-line (haversine) from official coordinates.
Getting there & around
- Easy by car — there's parking close to the beach.
- Bus stop: Lac de Sillé, about ~130 m away.
Food, stays & town
- Nearest village: Le Grez, about ~3.0 km away.
- 3 places to eat within 1 km Closest is Le refuge du trappeur, about ~80 m away.
- 2 places to stay mapped nearby Closest is Camping Seasonova de la Forêt, about ~430 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).
- Families
- Water sports
Is the water clean at Lac de Sille Le Guillaume?
Thinking of swimming at Lac de Sille Le Guillaume? The short answer: its official EU Bathing Water rating for 2025 is Excellent — the highest official classification under the EU bathing-water 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. Water quality here has been improving: the rating moved from Good to Excellent in 2025. There's parking about ~120 m from the beach.
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 Sandy shore, Toilets, and Restaurant. The nearest town, Le Grez, is about ~3.0 km away.
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 Sarthe. There are 3 places to eat within a kilometre — Le refuge du trappeur is the closest, about ~80 m away.
Frequently asked questions
Is it safe to go in the water at Lac de Sille Le Guillaume?
Yes, without much reservation. Lac de Sille Le Guillaume holds the top EU Bathing Water classification, Excellent, for 2025, and 11 of 11 classified seasons here have rated Excellent or Good. Its rating has also been trending the right way, moving from Good to Excellent in 2025.
What is the sea temperature at Lac de Sille Le Guillaume today?
For Lac de Sille Le Guillaume, 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 Sarthe. On the modeled climatology here, August usually runs warmest.
When does Lac de Sille Le Guillaume have the warmest water?
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 Sarthe. Within that window, August is typically the single warmest month.
Where does the water quality rating come from?
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 Lac de Sille Le Guillaume doesn't have one published yet.
Is there parking near Lac de Sille Le Guillaume?
By car, it's easy — parking is right by the beach. By bus, the nearest stop is Lac de Sillé, about ~130 m away. The nearest town is Le Grez, about ~3.0 km away.