Surf Forecasts:
Belle Ile - Les Donnants surf forecast from 18 Aug 2026:
- Best quality surf: Saturday 22 Aug, 8AM (local time) - 3.5ft (1.1m), 8s period, WNW swell with cross-offshore winds.
- Most powerful swell: Thursday 20 Aug, 11PM (local time) - 5.5ft (1.7m), 9s period, WNW swell with 487 kJ wave energy.
- Next surfable swell (1★+): Saturday 22 Aug, 8AM (local time) - 3.5ft (1.1m), 8s period with WNW 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 8AM. The primary swell is predicted to be 1.1m and 8s period. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Belle Ile - Les Donnants in the next 16 days are 1.7m 9s and forecast to arrive on Thursday (Aug 20) at 11PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.8m 4s period and expected on Monday (Aug 24) at 2AM.
| Wave Type | Time (CEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 8AM (Sat 22nd Aug) | 3.5ft (1.1m) 8s |
| Best Surf | 8AM (Sat 22nd Aug) | 3.5ft (1.1m) 8s |
| Most Powerful | 11PM (Thu 20th Aug) | 5.5ft (1.7m) 9s |
Table - best surf conditions forecast for Belle Ile - Les Donnants over the next 16 days.
The Lowdown
Alright, let's get stuck into it.
Aye, it's Rusty here. Lookin' at the next couple of weeks, and honestly, for Belle Ile - Les Donnants, it's a right struggle. There's a long stretch ahead where you'll be lucky to even get a surfable wave. The first real glimmer of anything worth paddling out for doesn't show up until Saturday the 22nd, and even that's ordinary. There’s a solid gap of nothing from the get-go. We’ve got a massive chunk of the 16 day window that's not even worth considering.
The water here is about 68°F, which is bang on average for the time of year at Les Donnants, so nothin' special there.
The first chance of a wave is on the Saturday morning the 22nd. We've got a clean little 3ft swell from the WNW with a period of 8 seconds, and the wind is a light cross-offshore from the NNE at only 6 mph. That’s about as clean as it gets for this spot in this forecast. The combined energy is only weak though (140), so it's not gonna have much punch. It’s surfable but very ordinary, so temper your expectations.
Then Sunday morning the 23rd offers a similar vibe: 2ft from the WNW, period of 7 seconds, and again that light 6 mph cross-offshore from the NNE. It's clean, but the combined energy is a pathetic 64. Tiny, weak, and barely worth peeling out of bed for.
After that, things just drop off a cliff energy-wise for the rest of the first week and into the second. We're talking 1.0ft and 0.7ft for days on end through Monday and Tuesday. It’s a write-off.
The end of the window gets a bit spicy, but all for the wrong reasons. Around Thursday the 27th and Friday the 28th of August, the swell pumps up, but it’s accompanied by brutal onshore winds. On Thursday morning you’ve got a 7ft swell from the W (9 seconds) with 28 mph cross-onshore winds from the SW. That's strong, messy, and blown-out. Combined energy hits 732, so there's power, but it's pure chaos. By Friday morning the 28th, the swell hits 10ft from the SW with 16 mph onshore winds. Even though the wind has eased a fraction, the combination of 10ft dumping onshore slop is only for the experts, and it's still ugly. The combined energy is a massive 1004, a heavy mess.
Overall, there's no standout session here. The only half-decent window is Saturday morning the 22nd and Sunday morning the 23rd, but it's tiny. If you're a kitesurfer, that Thursday and Friday with the strong wind and 7 to 10ft of messy swell might look interesting, but for a paddle surfer, it's ugly.
Big-hearted, but there's nothin' here to get excited about. Keep an eye on it, things can change, but I wouldn't hold my breath.
Rusty.
Short Range ForecastLight rain (total 3mm), mostly falling on Wed afternoon. Warm (max 21°C on Wed morning, min 16°C on Fri morning). Mainly fresh winds. | Days 5-7 Weather SummaryLight rain (total 2mm), mostly falling on Sat night. Very mild (max 19°C on Sat night, min 14°C on Mon morning). Winds decreasing (fresh winds from the WNW on Fri night, light winds from the W by Sat afternoon). | |||||||||||||||||||
Tue 18 | Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | ||||||||||||||
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 6 | W 8 | WSW 4 | W 6 | WNW 9 | WNW 8 | WNW 9 | WNW 10 | WNW 10 | WNW 10 | WNW 9 | WNW 8 | WNW 8 | WNW 5 | WNW 7 | WNW 7 | WNW 6 | NW 6 | NW 6 | W 9 |
Wave Graph | ||||||||||||||||||||
33 | 19 | 17 | 146 | 119 | 270 | 442 | 426 | 334 | 299 | 189 | 140 | 66 | 51 | 40 | 29 | 15 | 13 | 13 | 14 | |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | on | cross-on | cross-on | on | on | on | on | cross-on | on | cross-on | cross-off | on | cross-off | cross-off | on | cross | cross-off | on | off |
High Tide | 9:12PM3.58m | 9:30AM3.40m | 9:51PM3.24m | 10:13AM3.14m | 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 | |||||||
Low Tide | 3:17PM0.69m | 3:40AM0.88m | 4:04PM1.03m | 4:28AM1.21m | 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 | |||||||
— | — | 7:13 | — | — | 7:15 | — | — | 7:16 | — | — | 7:16 | — | — | 7:18 | — | — | 7:20 | — | — | |
— | 9:20 | — | — | 9:17 | — | — | 9:15 | — | — | 9:15 | — | — | 9:13 | — | — | 9:10 | — | — | 9:08 | |
mm | — | — | — | 1 | — | 1 | — | 1 | — | — | — | — | — | 1 | — | — | 1 | — | — | — |
Temp °C | 19 | 20 | 21 | 21 | 19 | 18 | 19 | 18 | 16 | 18 | 18 | 15 | 17 | 19 | 16 | 18 | 16 | 14 | 17 | 19 |
Feels °C | 16 | 18 | 18 | 18 | 14 | 14 | 15 | 14 | 14 | 14 | 13 | 13 | 13 | 17 | 15 | 14 | 10 | 13 | 14 | 16 |
Swell 1 Height (m) Direction Period (s) | W 8 | W 8 | W 7 | WNW 10 | WNW 9 | W 9 | — | WNW 10 | WNW 10 | WNW 10 | WNW 9 | WNW 8 | W 9 | WNW 7 | WNW 7 | W 9 | WNW 6 | NW 6 | W 8 | NW 4 |
12 | 19 | 17 | 54 | 98 | 28 | — | 426 | 334 | 299 | 189 | 140 | 43 | 19 | 40 | 13 | 15 | 9 | 13 | 5 | |
Swell 2 Height (m) Direction Period (s) | — | NW 6 | NW 7 | W 13 | — | — | — | — | — | — | — | — | — | W 9 | W 9 | — | W 8 | W 8 | — | W 9 |
— | 2 | 7 | 4 | — | — | — | — | — | — | — | — | — | 25 | 24 | — | 12 | 13 | — | 14 | |
Swell 3 Height (m) Direction Period (s) | — | — | WNW 10 | — | — | — | — | — | — | — | — | — | — | — | — | — | W 10 | — | W 9 | NW 6 |
— | — | 10 | — | — | — | — | — | — | — | — | — | — | — | — | — | 2 | — | 2 | 1 | |
Wind waves Height (m) Direction Period (s) | WNW 6 | WNW 6 | WSW 4 | W 6 | WNW 6 | WNW 8 | WNW 9 | WNW 9 | — | — | — | — | WNW 8 | WNW 5 | — | WNW 7 | NNE 4 | NE 3 | NW 6 | — |
33 | 17 | 14 | 146 | 119 | 270 | 442 | 308 | — | — | — | — | 66 | 51 | — | 29 | 19 | 2 | 9 | — | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 618 | 90 | 148 | 158 | 156 | 322 | 436 | 43 | 36 | 148 | 28 | 0 | 173 | 0 | 0 | 346 | 356 | 407 | 436 | 443 |
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.











