Surf Forecasts:
Belle Ile - Les Donnants surf forecast from 12 Sep 2026:
- Best quality surf: Sunday 13 Sep, 5AM (local time) - 3.5ft (1.0m), 10s period, WNW swell with cross-offshore winds.
- Most powerful swell: Friday 18 Sep, 5PM (local time) - 5.5ft (1.7m), 16s period, WNW swell with 1,375 kJ wave energy.
- Next surfable swell (1★+): Sunday 13 Sep, 5AM (local time) - 3.5ft (1.0m), 10s 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 Sunday (Sep 13) at 5AM. The primary swell is predicted to be 1.0m and 10s period with a secondary swell of 0.3m and 13s. 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 16s and forecast to arrive on Friday (Sep 18) at 5PM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.5m 4s period and expected on Thursday (Sep 17) at 2AM.
| Wave Type | Time (CEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 5AM (Sun 13th Sep) | 3.5ft (1.0m) 10s |
| Best Surf | 5AM (Sun 13th Sep) | 3.5ft (1.0m) 10s |
| Most Powerful | 5PM (Fri 18th Sep) | 5.5ft (1.7m) 16s |
Table - best surf conditions forecast for Belle Ile - Les Donnants over the next 16 days.
The Lowdown
Alright, Rusty here. Let’s take a look at what’s brewing for Belle Ile – Les Donnants.
The next couple of weeks are a bit of a mixed bag. We get a tiny window of clean surf right at the start, then a long stretch of messy conditions before a proper standout session arrives a week from Sunday. Get ready to be patient.
We start off this Sunday morning, 13th of September, with a bit of hope. Glassy conditions and a clean 4ft swell coming from the WNW with a period of 11 seconds. The combined energy is moderate at 297, so there’s some push. For a beginner-friendly, consistent river break, this is actually a nice little window. The water temp is about average for this time of year.
That’s the only good moment for a while though. Sunday afternoon the wind swings onshore and things get rough. From Monday the 14th right through Saturday the 19th, it’s a write-off. The wind is almost always onshore or cross-onshore, turning any swell into choppy slop. The energy spikes hard on Friday the 18th (1375 combined energy), but with 6ft of onshore WNW swell, it’s just a big, messy, lumpy mess – more for kite surfers than paddle surfers.
Now, circle the 20th of September on your calendar. That Sunday afternoon is the true standout of the entire forecast. We’ve got 5ft of WNW groundswell, a very long 15-second period, and the wind goes glassy from the ESE. The combined energy is strong at 1184, and the conditions are described as excellent for experienced surfers. This is clean, powerful, and lined up. At 5ft it’s pushing into expert territory for the average surfer, so know your limits. That long-period swell will be reeling down the point.
Monday the 21st still has some pulse with glassy conditions in the afternoon and 4ft of long-period swell, but the energy is dropping. By Tuesday the 22nd the swell fades to 3ft, and after that, it’s a long, slow decline with tiny, weak waves for the rest of the week and beyond. Nothing worth paddling for after that.
So, the call is simple: Sunday morning the 13th for a fun, clean beginner-friendly session, and Sunday afternoon the 20th for the big, glassy, expert-level set waves. Don’t sleep on that second week Sunday.
Rusty.
Short Range ForecastMostly dry. Warm (max 24°C on Mon night, min 17°C on Sat night). Winds increasing (calm on Sun morning, fresh winds from the NW by Tue afternoon). | Days 5-7 Weather SummaryLight rain (total 2mm), mostly falling on Thu morning. Very mild (max 19°C on Tue night, min 15°C on Tue night). Winds decreasing (strong winds from the NW on Tue night, light winds from the WNW by Fri morning). | ||||||||||||||||||
Sunday 13 | Monday 14 | Tuesday 15 | Wednesday 16 | Thursday 17 | Friday 18 | ||||||||||||||
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 10 | WNW 11 | WNW 11 | WNW 10 | WNW 10 | W 9 | W 9 | W 8 | WNW 11 | WNW 10 | WNW 9 | WNW 10 | WNW 11 | WNW 10 | WNW 10 | WNW 9 | WNW 16 | WNW 16 | WNW 14 |
Wave Graph  | |||||||||||||||||||
 kJ | 160 | 297 | 292 | 222 | 157 | 103 | 76 | 69 | 319 | 452 | 307 | 492 | 643 | 326 | 294 | 211 | 337 | 1375 | 826 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | glassy | on | cross-off | off | cross-on | cross | cross-on | cross-on | cross-on | cross-on | on | cross-on | on | on | cross-on | cross-on | on | cross-on |
High Tide | 6:41AM4.28m | 6:55PM4.39m | 7:11AM4.18m | 7:26PM4.16m | 7:40AM4.00m | 7:56PM3.87m | 8:10AM3.76m | 8:27PM3.55m | 8:42AM3.48m | 9:02PM3.22m | 9:20AM3.19m | 9:47PM2.90m | |||||||
Low Tide | 00:32AM-0.12m | 12:46PM-0.04m | 1:08AM0.03m | 1:23PM0.13m | 1:43AM0.28m | 2:00PM0.38m | 2:18AM0.60m | 2:39PM0.70m | 2:56AM0.94m | 3:22PM1.05m | 3:41AM1.28m | 4:16PM1.38m | 4:41AM1.57m | ||||||
 |  | |  | | | | | |  | | | |  |  | |  | | | |
 | — | 7:46 | — | — | 7:48 | — | — | 7:48 | — | — | 7:50 | — | — | 7:52 | — | — | 7:52 | — | — |
 | 8:31 | — | 8:30 | — | — | 8:28 | — | — | 8:25 | — | — | 8:23 | — | — | 8:22 | — | — | 8:20 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | 1 | — | — | — | — |
Temp °C | 18 | 17 | 18 | 21 | 19 | 23 | 24 | 21 | 20 | 19 | 15 | 17 | 18 | 17 | 18 | 17 | 17 | 17 | 17 |
Feels °C | 16 | 17 | 17 | 18 | 18 | 23 | 22 | 20 | 16 | 12 | 12 | 14 | 11 | 14 | 14 | 11 | 14 | 14 | 14 |
Swell 1 Height (m) Direction Period (s) | WNW 10 | WNW 11 | WNW 11 | WNW 10 | WNW 10 | W 9 | W 9 | W 8 | WNW 11 | W 10 | WNW 9 | WNW 13 | WNW 11 | WNW 10 | WNW 10 | WNW 9 | WNW 10 | WNW 16 | WNW 14 |
| kJ | 160 | 297 | 292 | 222 | 157 | 103 | 76 | 69 | 47 | 71 | 307 | 96 | 643 | 326 | 131 | 211 | 242 | 1375 | 826 |
Swell 2 Height (m) Direction Period (s) | WNW 13 | — | — | WNW 10 | NW 11 | NW 10 | WNW 10 | WNW 12 | — | — | — | — | — | — | — | — | WNW 16 | — | — |
| kJ | 67 | — | — | 128 | 5 | 23 | 9 | 14 | — | — | — | — | — | — | — | — | 337 | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | W 13 | NW 9 | — | — | — | — | — | — | — | — | NW 12 | — | — |
| kJ | — | — | — | — | — | — | 4 | 3 | — | — | — | — | — | — | — | — | 67 | — | — |
Wind waves Height (m) Direction Period (s) | NNW 2 | — | — | — | ENE 3 | — | — | — | WNW 11 | WNW 10 | — | WNW 10 | N 4 | — | WNW 10 | NNE 3 | — | — | — |
| kJ | 1 | — | — | — | 1 | — | — | — | 319 | 452 | — | 492 | 6 | — | 294 | 1 | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 28 | 0 | 81 | 28 | 0 | 101 | 28 | 43 | 618 | 44 | 44 | 158 | 36 | 158 | 158 | 36 | 36 | 148 | 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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