France · French Guiana
Lac Bois Diable
French Guiana, 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 | 27.6 | 0.6 |
| Thu 3 | 27.4 | 0.6 |
| Fri 4 | 27.0 | 0.6 |
| Sat 5 | 26.5 | 0.6 |
| Sun 6 | 26.5 | 0.6 |
| Mon 7 | 26.8 | 0.6 |
| Tue 8 | 27.3 | 0.6 |
Water quality history
Official EEA classification, one rating per bathing season, 2015–2025 — real data reported by national authorities.
- 2015: Good2015
- 2016: Sufficient2016
- 2017: Poor2017
- 2018: Poor2018
- 2019: Poor2019
- 2020: Poor2020
- 2021: Poor2021
- 2022: Poor2022
- 2023: Poor2023
- 2024: Poor2024
- 2025: Poor2025
Poor in the most recent season, and 1 of 11 classified years rated Excellent or Good.
- Excellent
- Good
- Sufficient
- Poor
- Not classified
View as table
| Year | Classification |
|---|---|
| 2015 | Good |
| 2016 | Sufficient |
| 2017 | Poor |
| 2018 | Poor |
| 2019 | Poor |
| 2020 | Poor |
| 2021 | Poor |
| 2022 | Poor |
| 2023 | Poor |
| 2024 | Poor |
| 2025 | Poor |
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 | 23 |
| Feb | 22 |
| Mar | 23 |
| Apr | 24 |
| May | 26 |
| Jun | 28 |
| Jul | 29 |
| Aug | 29 |
| Sep | 29 |
| Oct | 28 |
| Nov | 26 |
| Dec | 24 |
Location & nearby beaches
Nearby beaches
- Plage Pollux2.6 kmFrench Guiana
- Plage Castor2.9 kmFrench Guiana
- Plage Des Roches3.8 kmFrench Guiana
- Plage de Bourda50 kmFrench Guiana
Distances calculated as straight-line (haversine) from official coordinates.
Getting there & around
- By car: there's parking about ~590 m from the beach.
- Nearest bus stop is about ~450 m away.
Food, stays & town
- Nearest town: Kourou, about ~2.6 km away.
- 4 places to eat within 1 km Closest is L'instant Café, about ~120 m away.
- 5 places to stay mapped nearby Closest is Mercure Ariatel, about ~270 m away.
- 12 shops nearby, the closest about ~550 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 Lac Bois Diable?
Lac Bois Diable sits on a stretch of coast classed as a lake bathing site, carrying an official EU Bathing Water rating of Poor 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 French Guiana. There's parking about ~590 m from the beach.
Over the 11 classified seasons on record, 1 have come back Excellent or Good — a track record worth checking each year rather than assuming. If you're timing a visit around water temperature rather than crowds, June–October is the safest bet, with August typically the peak — expect a cooler, calmer sea either side of that stretch. The nearest town, Kourou, is about ~2.6 km away.
“Poor” 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 4 places to eat within a kilometre — L'instant Café is the closest, about ~120 m away.
Frequently asked questions
Is Lac Bois Diable safe to swim in?
Caution is advised — Lac Bois Diable's official 2025 rating is Poor. Check for local advisories and posted flags before going in.
What is the sea temperature at Lac Bois Diable today?
For Lac Bois Diable, 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 French Guiana. On the modeled climatology here, August usually runs warmest.
When is the best time to swim at Lac Bois Diable?
For the warmest water, aim for June–October — that's when the modeled sea temperature is typically at its best. That applies to the water around French Guiana. 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 Bois Diable doesn't have one published yet.
Is there parking near Lac Bois Diable?
By car, there's parking about ~590 m from the beach. There's a bus stop about ~450 m from the beach. The nearest town is Kourou, about ~2.6 km away.