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 | 24.3 | 0.6 |
| Thu 3 | 24.1 | 0.6 |
| Fri 4 | 23.6 | 0.6 |
| Sat 5 | 23.1 | 0.6 |
| Sun 6 | 23.1 | 0.6 |
| Mon 7 | 23.5 | 0.6 |
| Tue 8 | 24.0 | 0.6 |
Water quality history
Official EEA classification, one rating per bathing season, 2015–2025 — real data reported by national authorities.
- 2015: Good2015
- 2016: Good2016
- 2017: Good2017
- 2018: Sufficient2018
- 2019: Good2019
- 2020: Good2020
- 2021: Excellent2021
- 2022: Excellent2022
- 2023: Good2023
- 2024: Good2024
- 2025: Good2025
Good in the most recent season, and 10 of 11 classified years rated Excellent or Good.
- Excellent
- Good
- Sufficient
- Poor
- Not classified
View as table
| Year | Classification |
|---|---|
| 2015 | Good |
| 2016 | Good |
| 2017 | Good |
| 2018 | Sufficient |
| 2019 | Good |
| 2020 | Good |
| 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 | 17 |
| May | 20 |
| Jun | 22 |
| Jul | 24 |
| Aug | 25 |
| Sep | 24 |
| Oct | 22 |
| Nov | 20 |
| Dec | 17 |
Location & nearby beaches
Nearby beaches
- 24 km
- 29 km
- Brienon Sur Armancon31 kmYonne
- Mailly-La-Ville37 kmYonne
Distances calculated as straight-line (haversine) from official coordinates.
Getting there & around
- Easy by car — there's parking close to the beach.
- Bus stop: Hopital, about ~620 m away.
Food, stays & town
- Nearest town: Tonnerre, about ~800 m away.
- 23 places to eat within 1 km Closest is Musée du Chevalier d'Éon, about ~500 m away.
- 7 places to stay mapped nearby Closest is Camping La Cascade, about ~200 m away.
- 5 shops nearby, the closest about ~690 m away
What kind of beach is this?
This is a town beach, woven into the everyday fabric of a city or larger settlement — expect company on warm days, especially through July and August, alongside easy access to shops and services.
Estimated from OpenStreetMap surroundings data (ODbL).
Is the water clean at Tonnerre - la Cascade?
Tonnerre - la Cascade sits on a stretch of coast classed as a river 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 Yonne. There's parking about ~80 m from the beach.
Over the 11 classified seasons on record, 10 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. It's been a consistently reliable spot too — the rating has held at Good for 3 straight years. The nearest town, Tonnerre, is about ~800 m away.
That “Good” label comes from a full season of official water sampling, not a single test — it's one step on a four-point scale (Excellent, Good, Sufficient, Poor) reassessed once a year. Today's actual conditions can differ from the seasonal average, so for a live snapshot see the “Right now” and 7-day outlook panels above. There are 23 places to eat within a kilometre — Musée du Chevalier d'Éon is the closest, about ~500 m away.
Frequently asked questions
Should you swim at Tonnerre - la Cascade?
Yes. Tonnerre - la Cascade's official 2025 rating is Good — one notch below the top classification — and 10 of 11 classified seasons here have rated Excellent or Good. It's also held steady at Good for 3 straight years.
What is the sea temperature at Tonnerre - la Cascade today?
Treat the ~24°C above as illustrative only — Tonnerre - la Cascade's live marine feed was down when this page was generated, and the figure will be replaced with a real reading automatically once it's back. That's the reading right off Yonne. On the modeled climatology here, August usually runs warmest.
When does Tonnerre - la Cascade 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 Yonne. 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 Tonnerre - la Cascade doesn't have one published yet.
Is there parking near Tonnerre - la Cascade?
By car, it's easy — parking is right by the beach. By bus, the nearest stop is Hopital, about ~620 m away. The nearest town is Tonnerre, about ~800 m away.