Surf Forecasts:
Belle Ile - Les Donnants surf forecast from 20 Aug 2026:
- Best quality surf: Wednesday 26 Aug, 2PM (local time) - 6ft (1.8m), 8s period, WSW swell with cross-offshore winds.
- Most powerful swell: Thursday 27 Aug, 2PM (local time) - 7ft (2.2m), 9s period, WSW swell with 773 kJ wave energy.
- Next surfable swell (1★+): Saturday 22 Aug, 11AM (local time) - 2ft (0.6m), 9s period with W swell.
Best Forecast Surf Conditions for Belle Ile - Les Donnants this week:
The surf forecast for Belle Ile - Les Donnants over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Saturday (Aug 22) at 11AM. The primary swell is predicted to be 0.6m and 9s period with a secondary swell of 0.6m and 8s. The wind is predicted to be offshore as the swell arrives.
The most powerful waves expected at Belle Ile - Les Donnants in the next 16 days are 2.2m 9s and forecast to arrive on Thursday (Aug 27) at 2PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.3m 5s period and expected on Sunday (Aug 23) at 8AM.
| Wave Type | Time (CEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 11AM (Sat 22nd Aug) | 2ft (0.6m) 9s |
| Best Surf | 2PM (Wed 26th Aug) | 6ft (1.8m) 8s |
| Most Powerful | 2PM (Thu 27th Aug) | 7ft (2.2m) 9s |
Table - best surf conditions forecast for Belle Ile - Les Donnants over the next 16 days.
The Lowdown
Hey folks, Rusty here. Bit of a grim run on the cards for Belle Ile's Les Donnants (river mouth) over the next couple of weeks. We've got a long stretch of nothing worth paddling out for, so let's be straight about it.
The water temp is sitting at 68° which is pretty much average for this time of year, nothing unusual there. But that's about the only thing that's normal.
First up, Thursday the 20th of August brings a messy 6ft swell from the WNW with a 9-second period, but that 19 mph onshore wind from the W is just gonna trash it. No point even looking. That sets the tone for a solid week of poor conditions. Friday the 21st offers a cleaner 5ft swell in the morning, but the cross-on wind from the NW at 12 mph has it chopped out, and the afternoon just gets worse.
Saturday the 22nd of August has a glimmer. The morning brings a tiny 2ft from the W with a clean offshore breeze from the ENE at 12 mph. The combined energy is weak (89). Then the afternoon glass off with zero wind and a 2ft swell (66 energy) – it's super small and ordinary, but if you're desperate for a bump on a longboard, it's the cleanest window we get in the first week.
After that, forget it. Sunday the 23rd through to Thursday the 28th of August are all blown out, with onshores and cross-onshores constantly ruining the shape, and energy bouncing from low to moderate. The 7ft swell on Wednesday the 26th (615 energy) has a cross-on shore that'll just be a washing machine. By Thursday the 27th, we're into 6ft to 8ft swells (495 to 592 energy) but with risk of thunderstorms and strong onshores – that's kite-surfing territory, not paddle-surfing. The 8ft stuff on Friday the 28th (902 energy) and Saturday the 29th's 10ft (a strong 1190 to 1367 energy) is pure chaos for experts only, and the wind is howling onshore.
After that first week of trash, we get a small shift starting Thursday the 3rd of September. A 6ft swell from the WSW (327 energy) with a cross-offshore breeze from the NE at 19 mph – that's clean. Not great, but clean. Friday the 4th of September morning gets a 5ft from the WNW with a true offshore from the ENE at 16 mph (344 energy) and it's looking clean. Then Friday afternoon, glassy as can be with a NE breeze at just 3 mph, a 4ft swell (232 energy) – that's the real standout of the entire 16-day run. It'll be small, but it'll be the best wave shape you'll get, with light crowds possible. The only other mention is Thursday the 3rd afternoon with a clean cross-offshore, also marginal but rideable.
Fact is, this spot is consistent, so this blank run is pretty unusual – it tends not to stay this poor for long. But for the next two weeks, there's only one window that gets a genuine nod: the afternoon of Friday the 4th of September. Set your alarm.
Rusty.
Short Range ForecastMostly dry. Warm (max 22°C on Sat night, min 15°C on Fri night). Winds increasing (calm on Sat afternoon, strong winds from the ENE by Sun morning). | Days 5-7 Weather SummaryHeavy rain (total 22mm), heaviest during Wed morning. Warm (max 27°C on Sun night, min 17°C on Mon morning). Mainly strong winds. | |||||||||||||||||||
Thu 20 | Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | Tuesday 25 | Wednesday 26 | ||||||||||||||
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) | WNW 9 | WNW 10 | WNW 10 | WNW 9 | WNW 8 | W 9 | W 10 | W 9 | W 9 | WSW 12 | WSW 10 | WSW 9 | WSW 9 | WSW 8 | SW 8 | SW 8 | SW 7 | WSW 9 | WSW 8 | WSW 8 |
Wave Graph  | ||||||||||||||||||||
 kJ | 561 | 442 | 341 | 360 | 190 | 52 | 45 | 25 | 13 | 47 | 38 | 34 | 32 | 28 | 32 | 23 | 205 | 615 | 315 | 333 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | cross-on | cross-on | on | cross-off | off | glassy | cross-off | off | cross-off | cross-off | off | cross-off | cross-on | cross-on | cross-on | cross | cross-on | cross | cross-on |
High Tide | 10:42PM2.93m | 11:18AM2.91m | 00:19AM2.73m | 1:22PM2.84m | 2:25AM2.79m | 2:53PM3.02m | 3:27AM3.01m | 3:44PM3.28m | 4:08AM3.25m | 4:21PM3.56m | 4:40AM3.50m | 4:52PM3.83m | ||||||||
Low Tide | 4:59PM1.33m | 5:28AM1.48m | 6:12PM1.53m | 6:45AM1.61m | 7:35PM1.54m | 8:05AM1.53m | 8:48PM1.37m | 9:08AM1.31m | 9:41PM1.11m | 9:56AM1.03m | 10:24PM0.82m | 10:35AM0.75m | 11:00PM0.55m | |||||||
 |  |  | |  | |  | | | | | |  |  | | |  |  | | | |
 | — | — | 7:16 | — | — | 7:16 | — | — | 7:18 | — | — | 7:20 | — | — | 7:20 | — | — | 7:22 | — | — |
 | — | 9:15 | — | — | 9:15 | — | — | 9:13 | — | — | 9:10 | — | — | 9:08 | — | — | 9:07 | — | — | 9:05 |
mm | — | — | — | — | — | — | — | — | — | — | — | — | 2 | 2 | — | 3 | 1 | 14 | 21 | 4 |
Temp °C | 19 | 19 | 17 | 18 | 19 | 15 | 20 | 22 | 17 | 25 | 27 | 18 | 20 | 21 | 21 | 21 | 20 | 19 | 17 | 19 |
Feels °C | 15 | 14 | 14 | 13 | 15 | 12 | 19 | 18 | 9 | 19 | 21 | 10 | 19 | 18 | 19 | 17 | 17 | 18 | 14 | 15 |
Swell 1 Height (m) Direction Period (s) | WNW 9 | WNW 10 | WNW 10 | — | WNW 8 | WNW 8 | W 10 | W 9 | W 9 | SE 5 | WSW 10 | WSW 9 | WSW 9 | WSW 8 | SW 8 | SW 8 | NW 10 | WSW 9 | WSW 8 | WSW 8 |
| kJ | 561 | 442 | 341 | — | 190 | 37 | 45 | 25 | 13 | 11 | 38 | 34 | 32 | 28 | 32 | 16 | 23 | 615 | 315 | 333 |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | W 9 | WNW 7 | NW 7 | WNW 7 | WSW 12 | NW 7 | W 9 | W 9 | SSE 5 | WNW 11 | WNW 10 | — | — | WNW 9 | WNW 10 |
| kJ | — | — | — | — | — | 52 | 21 | 14 | 4 | 47 | 2 | 2 | 2 | 7 | 12 | 22 | — | — | 27 | 34 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | NW 4 | W 14 | NW 7 | — | — | E 3 | W 9 | W 8 | W 8 | — | — | — | — |
| kJ | — | — | — | — | — | — | — | 1 | 4 | 2 | — | — | 2 | 6 | 5 | 1 | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | — | — | WNW 9 | NNE 3 | NE 3 | — | ENE 4 | E 5 | ENE 4 | ENE 4 | E 5 | ESE 4 | — | S 4 | SW 4 | SW 7 | — | — | — |
| kJ | — | — | — | 360 | 4 | 2 | — | 20 | 75 | 8 | 43 | 43 | 10 | — | 6 | 23 | 205 | — | — | — |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 202 | 28 | 90 | 158 | 30 | 0 | 0 | 101 | 346 | 101 | 343 | 343 | 465 | 167 | 121 | 121 | 117 | 118 | 52 | 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.
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