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 | 25.0 | 0.4 |
| Thu 3 | 24.6 | 0.4 |
| Fri 4 | 24.1 | 0.4 |
| Sat 5 | 23.8 | 0.4 |
| Sun 6 | 24.1 | 0.4 |
| Mon 7 | 24.6 | 0.4 |
| Tue 8 | 25.0 | 0.4 |
Water quality history
Official EEA classification, one rating per bathing season, 2015–2025 — real data reported by national authorities.
- 2015: Excellent2015
- 2016: Not classified2016
- 2017: Excellent2017
- 2018: Excellent2018
- 2019: Excellent2019
- 2020: Excellent2020
- 2021: Excellent2021
- 2022: Excellent2022
- 2023: Excellent2023
- 2024: Good2024
- 2025: Excellent2025
Excellent in the most recent season, and 10 of 10 classified years rated Excellent or Good.
- Excellent
- Good
- Sufficient
- Poor
- Not classified
View as table
| Year | Classification |
|---|---|
| 2015 | Excellent |
| 2016 | Not classified |
| 2017 | Excellent |
| 2018 | Excellent |
| 2019 | Excellent |
| 2020 | Excellent |
| 2021 | Excellent |
| 2022 | Excellent |
| 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 | 14 |
| Feb | 14 |
| Mar | 14 |
| Apr | 16 |
| May | 19 |
| Jun | 22 |
| Jul | 24 |
| Aug | 25 |
| Sep | 24 |
| Oct | 22 |
| Nov | 19 |
| Dec | 16 |
Location & nearby beaches
Nearby beaches
- 26 km
- Meaux - Plage Du Chemin Des Patis45 kmSeine-et-Marne
- Jablines - Ile de Loisirs de Jablines Annet48 kmSeine-et-Marne
- 49 km
Distances calculated as straight-line (haversine) from official coordinates.
Getting there & around
- Easy by car — there's parking close to the beach.
- Nearest bus stop is about ~330 m away.
Food, stays & town
- Nearest village: Rivecourt, about ~1.7 km 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 Base Nautique Longueil?
Base Nautique Longueil sits on a stretch of coast classed as a lake bathing site, carrying an official EU Bathing Water rating of Excellent 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 Oise. There's parking about ~90 m from the beach.
That rating has been consistent: every one of the 10 classified seasons on record has come back Excellent or Good. 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 Good to Excellent in 2025. The nearest town, Rivecourt, is about ~1.7 km away.
That “Excellent” 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.
Frequently asked questions
Is Base Nautique Longueil safe to swim in?
Yes, without much reservation. Base Nautique Longueil holds the top EU Bathing Water classification, Excellent, for 2025, and 10 of 10 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 temperature is the sea at Base Nautique Longueil right now?
For Base Nautique Longueil, the ~24°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 Oise. On the modeled climatology here, August usually runs warmest.
When should you plan a swimming trip to Base Nautique Longueil?
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 Oise. Within that window, August is typically the single warmest month.
Who measures the water quality rating, and how?
It's based on official water samples: authorities test for intestinal enterococci and E. coli through the season, then report the full-season results to the European Environment Agency each spring, which assigns one of four grades — Excellent, Good, Sufficient or Poor. A few national authorities, including Croatia's IZOR, also publish individual samples during the season itself, ahead of that annual report — that isn't yet available for Base Nautique Longueil.
Is there parking near Base Nautique Longueil?
By car, it's easy — parking is right by the beach. There's a bus stop about ~330 m from the beach. The nearest town is Rivecourt, about ~1.7 km away.