
Surf Forecasts:
Belle Ile - Les Donnants surf forecast from 4 Aug 2026:
- Most powerful swell: Wednesday 5 Aug, 8PM (local time) - 5ft (1.6m), 8s period, W swell with 316 kJ wave energy.
Best Forecast Surf Conditions for Belle Ile - Les Donnants this week:
The most powerful waves expected at Belle Ile - Les Donnants in the next 16 days are 1.6m 8s and forecast to arrive on Wednesday (Aug 05) at 8PM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.7m 4s period and expected on Friday (Aug 07) at 2AM.
| Wave Type | Time (CEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 8PM (Wed 5th Aug) | 5ft (1.6m) 8s |
Table - best surf conditions forecast for Belle Ile - Les Donnants over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s get straight into it for our local stretch.
Honestly, I’ve had a good look at the next 16 days and it’s a pretty bleak run for Belle Ile - Les Donnants (France). The river mouth setup here is exposed to the SW, and we’re just not getting much love from the ocean. There’s a long dry spell ahead, with no decent surf on the cards for the whole first week and a half. From Tuesday the 4th right through to Tuesday the 18th, it’s all poor surf conditions – small, weak, messy, and mostly onshore. The combined energy values are mostly in the double digits, which is weak, peaking at just 287 on the 5th, but that’s with onshore winds and a 5ft swell that’s blown out. You’ll see a few mornings with offshore or glassy winds, like Saturday the 8th and Sunday the 9th, but the swell is barely a ripple – 0.7ft to 1ft. It’s just not worth paddling out.
Now, there is one little glimmer. On Wednesday the 19th, the morning session finally shows some promise. We’ve got a 5ft swell rolling in from the WNW, with a clean cross-off breeze from the NNE at 6 mph. That’s the standout, and the only time I’d even consider waxing the board. The combined energy jumps to 359 (moderate), and the wind is light, making for clean conditions. The water temp is sitting at 68°, which is about 1° above the long-term average – pretty normal for this time of year, so no surprises there. The swell direction is straight out of the SW optimum, and the period is 9 seconds, so it’s a short-period swell – not the most powerful, but at this spot, with clean wind, it’ll be rideable. Just keep in mind this is a river mouth, so the shape can be a bit fickle with a short-period groundswell, but it’s the best we’ve got. The afternoon looks poor again as the wind swings onshore, so get your session in early.
Bottom line: 16 days of mostly nothing, with one clean morning on the 19th. Don’t hold your breath, but keep an eye on that date.
Rusty.
Short Range ForecastMostly dry. Warm (max 21°C on Tue afternoon, min 15°C on Wed night). Mainly strong winds. | Days 4-6 Weather SummarySome drizzle, heaviest during Sun morning. Warm (max 26°C on Sat afternoon, min 14°C on Fri morning). Winds decreasing (fresh winds from the NE on Fri night, calm by Sun morning). | ||||||||||||||||||||
Tuesday 4 | Wednesday 5 | Thursday 6 | Friday 7 | Saturday 8 | Sunday 9 | Monday 10 | |||||||||||||||
AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | |
Swell Height Map | |||||||||||||||||||||
Wave Height (m) Direction Period (s) | WSW 8 | WSW 7 | WSW 7 | W 7 | W 8 | WNW 7 | WNW 7 | WNW 7 | WNW 5 | W 10 | W 9 | NW 5 | W 9 | WNW 11 | WNW 10 | WNW 9 | WNW 9 | WNW 6 | WNW 8 | WNW 8 | WNW 6 |
Wave Graph | |||||||||||||||||||||
104 | 147 | 128 | 128 | 287 | 177 | 49 | 45 | 31 | 16 | 15 | 24 | 6 | 12 | 38 | 32 | 32 | 34 | 27 | 105 | 40 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | on | on | on | cross | cross | on | cross-off | cross-off | on | cross-off | off | on | cross-off | glassy | cross-on | cross | cross-on | on | cross-off |
High Tide | 8:49AM3.74m | 9:07PM3.83m | 9:32AM3.60m | 9:55PM3.62m | 10:25AM3.43m | 10:56PM3.39m | 11:36AM3.29m | 00:22AM3.23m | 1:10PM3.29m | 2:02AM3.29m | 2:40PM3.50m | 3:21AM3.52m | 3:47PM3.83m | 4:21AM3.80m | |||||||
Low Tide | 3:10PM0.65m | 3:38AM0.68m | 3:58PM0.83m | 4:30AM0.88m | 4:58PM1.01m | 5:35AM1.06m | 6:13PM1.11m | 6:52AM1.14m | 7:35PM1.04m | 8:10AM1.03m | 8:51PM0.81m | 9:19AM0.78m | 9:55PM0.48m | ||||||||
6:54 | — | — | 6:54 | — | — | 6:56 | — | — | 6:58 | — | — | 6:58 | — | — | 7:00 | — | — | 7:01 | — | — | |
— | — | 9:43 | — | — | 9:40 | — | — | 9:39 | — | — | 9:37 | — | — | 9:37 | — | — | 9:35 | — | — | 9:32 | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | — | — | — | — | — |
Temp °C | 20 | 21 | 20 | 18 | 18 | 18 | 15 | 18 | 19 | 15 | 18 | 21 | 18 | 26 | 26 | 19 | 25 | 24 | 19 | 24 | 26 |
Feels °C | 19 | 20 | 18 | 14 | 14 | 12 | 12 | 13 | 11 | 13 | 17 | 17 | 14 | 22 | 20 | 15 | 21 | 20 | 16 | 18 | 19 |
Swell 1 Height (m) Direction Period (s) | WSW 8 | W 9 | W 9 | W 8 | — | WNW 7 | WNW 7 | W 10 | WNW 5 | NW 6 | W 9 | NW 5 | WNW 6 | WNW 11 | WNW 10 | WNW 9 | WNW 9 | WNW 6 | WNW 8 | — | WNW 6 |
104 | 27 | 23 | 5 | — | 177 | 49 | 18 | 31 | 9 | 15 | 24 | 3 | 12 | 38 | 32 | 32 | 34 | 27 | — | 40 | |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | W 10 | W 10 | — | W 10 | W 10 | — | W 9 | W 9 | W 9 | NW 4 | W 6 | W 9 | NW 9 | W 7 | — | WNW 9 |
— | — | — | — | — | 18 | 18 | — | 17 | 16 | — | 7 | 6 | 7 | 4 | 1 | 6 | 20 | 4 | — | 7 | |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | NW 7 | — | E 3 | — | — | ENE 3 | W 6 | W 6 | — | — | — | — | WSW 7 |
— | — | — | — | — | — | — | — | 2 | — | 1 | — | — | 1 | 1 | 1 | — | — | — | — | 4 | |
Wind waves Height (m) Direction Period (s) | — | WSW 7 | WSW 7 | W 7 | W 8 | NW 6 | — | WNW 7 | NNE 4 | NE 3 | NW 6 | NE 3 | ENE 3 | — | NE 3 | NE 3 | NW 3 | NNE 4 | NNW 4 | WNW 8 | NE 4 |
— | 147 | 128 | 128 | 287 | 36 | — | 45 | 11 | 1 | 9 | 7 | 5 | — | 4 | 6 | 3 | 14 | 15 | 105 | 16 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 101 | 101 | 156 | 90 | 158 | 32 | 87 | 436 | 49 | 277 | 692 | 280 | 139 | 90 | 90 | 101 | 336 | 90 | 90 | 436 | 101 |
Best forecast wave conditions in Morbihan - Brittany | |||||||||||||||||||||
Best forecast wave conditions in France | |||||||||||||||||||||
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Information about the Belle Ile - Les Donnants Surf forecast
The above surf forecast table for Belle Ile - Les Donnants provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Belle Ile - Les Donnants can be found by selecting the local surf guide option on the grey menu. Our Belle Ile - Les Donnants surf forecast is unique since it includes wave energy (power) that defines the real feel of the surf rather than just the height or the period. If you surf the same spot (Belle Ile - Les Donnants) regularly then make a mental note of the wave energy from the surf forecast table each time you go. Very soon you may start to choose your surf days based on the wave energy alone combined with our forecast of favourable offshore wind conditions. Our star ratings will help here and of course you will also find the usual wave height and period predictions on our surf forecasts as well as a full break down of the swell components under our advanced users option (to reveal that, click the little Einstein character under the tide times).
Further information to help with frequently asked questions about our surf forecast for Belle Ile - Les Donnants may be found under the help tab on the top menu and also by moving your mouse over the question marks on the surf forecast table itself. Please always bear in mind that the forecast is for near-shore open water and local factors at each surf break influence the actual breaking wave height, such as the beach / reef profile, water depths offshore and shelter.
Belle Ile - Les Donnants is 48 km (30 miles) from Lorient. If you plan a holiday in Morbihan - Brittany, look for hotels and other accommodation in Lorient. Lorient has rooms for a wide range of budgets as well as car hire and transport links.











