Surf Forecasts:
Belle Ile - Les Donnants surf forecast from 18 Aug 2026:
- Best quality surf: Saturday 22 Aug, 2AM (local time) - 4.5ft (1.3m), 9s period, WNW swell with cross-offshore winds.
- Most powerful swell: Thursday 20 Aug, 8PM (local time) - 5.5ft (1.7m), 10s period, WNW swell with 485 kJ wave energy.
- Next surfable swell (1★+): Saturday 22 Aug, 2AM (local time) - 4.5ft (1.3m), 9s 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 2AM. The primary swell is predicted to be 1.3m and 9s period with a secondary swell of 1.0m and 9s. 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 10s and forecast to arrive on Thursday (Aug 20) 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 0.9m 4s period and expected on Sunday (Aug 23) at 5AM.
| Wave Type | Time (CEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 2AM (Sat 22nd Aug) | 4.5ft (1.3m) 9s |
| Best Surf | 2AM (Sat 22nd Aug) | 4.5ft (1.3m) 9s |
| Most Powerful | 8PM (Thu 20th Aug) | 5.5ft (1.7m) 10s |
Table - best surf conditions forecast for Belle Ile - Les Donnants over the next 16 days.
The Lowdown
Alright, Rusty here. Let’s have a look at what’s cooking for the next couple of weeks.
Honestly, folks, it’s a pretty grim stretch for Belle Ile - Les Donnants. The entire 16-day window is a write-off for any decent paddle surfing. We’re looking at a solid run of “poor surf conditions” day after day. The wind is mostly onshore or cross-onshore, which is just going to wreck whatever small swell we get. The water is sitting at 68.9°, which is a touch warmer than normal for this time of year, but that’s about the only upside.
The first real chance of anything even remotely surfable comes on the morning of Thursday the 21st of August, but even then it’s labelled as marginal. We’ve got a 4.3ft swell from the WNW with a 10-second period, but the wind is howling onshore at 6 mph. It’s just not good. The energy is moderate (283), but it’s all blown out.
The only morning that looks clean is Saturday the 22nd of August. The wind swings around to a light cross-offshore from the NNE, giving us a clean surface. But the swell is tiny, only 3ft from the WNW with a short 8-second period, and the energy is weak (112). It’s surfable, but it’s very ordinary. You’d be out there for the exercise, not the waves.
We then hit a massive gap of several days with nothing worth a mention until the very end of the forecast. Around Tuesday the 1st of September, the swell really picks up, with 8.2ft waves from the west rolling in. The energy is very strong (over 1400), but the wind is a mess – fresh cross-shore or cross-onshore with rain and thunderstorms. That size, with that wind, at a river mouth? That’s going to be a washing machine. This setup looks far more interesting for kite surfing than paddle surfing. Even the morning of the 2nd of September has 8.2ft swell, but it’s still cross-shore and lumpy. This is big, powerful, and messy – strictly for experts only, and even then, it’s not going to be pretty.
All in all, the only highlight is that Saturday morning, August 22nd. It’s clean, but tiny. Don’t get your hopes up for the rest of it.
Short Range ForecastMostly dry. Warm (max 21°C on Wed afternoon, min 17°C on Tue morning). Mainly fresh winds. | Days 4-6 Weather SummaryLight rain (total 2mm), mostly falling on Fri night. Warm (max 22°C on Sun night, min 15°C on Sat night). Winds increasing (calm on Sat afternoon, fresh winds from the NNE by Sun night). | ||||||||||||||||||||
Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | |||||||||||||||
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) | WNW 7 | WNW 6 | W 8 | W 7 | WNW 10 | WNW 10 | WNW 8 | WNW 10 | WNW 9 | WNW 10 | WNW 9 | WNW 9 | WNW 8 | W 9 | W 9 | W 9 | W 9 | W 9 | W 8 | W 8 | W 8 |
Wave Graph  | |||||||||||||||||||||
 kJ | 27 | 33 | 19 | 27 | 83 | 129 | 227 | 434 | 329 | 283 | 216 | 251 | 112 | 62 | 39 | 24 | 14 | 14 | 12 | 13 | 12 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | on | on | cross-on | on | cross-on | on | on | on | on | on | cross-off | cross-off | on | cross-off | cross-off | on | cross-off | cross-off | on | cross-on |
High Tide | 8:55AM3.67m | 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 | ||||||||
 | |  |  | |  | | | | | |  |  | | | | | | | | | |
 | 7:11 | — | — | 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 | — | — | — | — | — | — | — | — |
Temp °C | 17 | 19 | 20 | 20 | 21 | 19 | 19 | 18 | 18 | 18 | 18 | 18 | 16 | 18 | 19 | 17 | 20 | 22 | 15 | 18 | 18 |
Feels °C | 16 | 16 | 18 | 19 | 17 | 16 | 15 | 14 | 13 | 17 | 16 | 14 | 14 | 15 | 16 | 11 | 17 | 17 | 12 | 15 | 15 |
Swell 1 Height (m) Direction Period (s) | W 9 | W 8 | NW 6 | W 7 | WNW 10 | WNW 10 | W 9 | WNW 10 | WNW 9 | WNW 10 | — | WNW 9 | WNW 8 | W 9 | W 9 | W 9 | W 9 | WNW 6 | W 8 | W 8 | NW 4 |
| kJ | 6 | 12 | 8 | 27 | 83 | 129 | 15 | 434 | 329 | 283 | — | 158 | 112 | 62 | 39 | 24 | 14 | 14 | 12 | 13 | 3 |
Swell 2 Height (m) Direction Period (s) | — | — | W 8 | NW 7 | W 8 | — | — | W 9 | — | — | — | — | — | WNW 8 | NW 7 | NW 7 | ESE 3 | W 9 | WNW 6 | ESE 3 | W 8 |
| kJ | — | — | 19 | 11 | 1 | — | — | 26 | — | — | — | — | — | 25 | 13 | 8 | 1 | 13 | 3 | 1 | 12 |
Swell 3 Height (m) Direction Period (s) | — | — | — | WNW 10 | — | — | — | — | — | — | — | — | — | E 3 | — | — | NE 3 | W 10 | W 9 | — | NW 8 |
| kJ | — | — | — | 10 | — | — | — | — | — | — | — | — | — | 1 | — | — | 2 | 2 | 2 | — | 3 |
Wind waves Height (m) Direction Period (s) | WNW 7 | WNW 6 | WNW 4 | — | WSW 5 | W 5 | WNW 8 | WNW 9 | — | — | WNW 9 | WNW 9 | ENE 3 | — | NE 4 | ENE 4 | NW 7 | NE 4 | ENE 4 | NW 6 | ENE 2 |
| kJ | 27 | 33 | 6 | — | 69 | 51 | 227 | 352 | — | — | 216 | 251 | 2 | — | 21 | 21 | 7 | 17 | 7 | 5 | 1 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 90 | 618 | 90 | 101 | 43 | 36 | 158 | 436 | 36 | 20 | 158 | 0 | 0 | 43 | 47 | 316 | 436 | 350 | 437 | 436 | 277 |
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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