Surf Forecasts:
Belle Ile - Les Donnants surf forecast from 14 Sep 2026:
- Best quality surf: Sunday 20 Sep, 11PM (local time) - 3ft (0.9m), 15s period, WNW swell with cross-offshore winds.
- Most powerful swell: Friday 18 Sep, 2PM (local time) - 6.5ft (2.0m), 16s period, WNW swell with 1,913 kJ wave energy.
- Next surfable swell (1★+): Monday 14 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 Monday (Sep 14) at 5AM. The primary swell is predicted to be 1.0m and 10s period with a secondary swell of 0.7m and 10s. Another secondary swell of 0.2m and 3s is also forecast. 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 2.0m 16s and forecast to arrive on Friday (Sep 18) at 2PM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.6m 3s period and expected on Monday (Sep 21) at 2AM.
| Wave Type | Time (CEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 5AM (Mon 14th Sep) | 3.5ft (1.0m) 10s |
| Best Surf | 11PM (Sun 20th Sep) | 3ft (0.9m) 15s |
| Most Powerful | 2PM (Fri 18th Sep) | 6.5ft (2.0m) 16s |
Table - best surf conditions forecast for Belle Ile - Les Donnants over the next 16 days.
The Lowdown
Alright, this is Rusty checkin' in from the coast. Let's have a look at what Belle Ile - Les Donnants has cookin' for us.
Right now, we're in a bit of a flat spell, not much to get excited about. The first proper chance to paddle out won't come until the morning of Sunday, September 20th. Before that, we've got a string of days where the wind is just mucking things up, blowing onshore or cross-onshore, making for choppy, bumpy conditions. The swell's around, but it's not clean.
Sunday the 20th morning is the first real glimmer of hope. The wind swings around to a light NNE cross-off, cleaning things right up. You're looking at waist-high sets, around 4 ft from the WNW, with moderate energy (244). It's not going to be epic, but it'll be clean and fun for a beginner-friendly wave.
Now, the standout of this whole outlook is the morning of Monday the 21st. This is the one to circle on the calendar. We've got a clean 5 ft swell from the WNW with a nice, long 14-second period pushing in. That's proper groundswell energy (752), and with a solid 12 mph easterly offshore wind, Belle Ile is going to be clean, lined up, and offering some proper shape. For a river break, that long period should hold up nicely. If you can get out, that's the session to aim for.
Things taper off pretty quickly after that. Tuesday the 22nd drops in size, and while the wind is okay, the swell is small. By Wednesday the 23rd, it's more of the same, but we do get some clean conditions. For the rest of the second week, the wind stays offshore, but the swell gets tiny. By Friday the 25th and into the weekend, it's barely a ripple, with strong winds making it hard to even catch the little bumps that are there. It's clean, but you'd be working hard for nothing.
So, in short: a slow start, a clean little session Sunday the 20th, a proper standout on Monday the 21st, and then a long, flat end to the run. The water temp is about average for this time of year, so nothing unusual there.
This is Rusty, signin' off.
Short Range ForecastMostly dry. Warm (max 22°C on Mon night, min 15°C on Tue night). Winds increasing (light winds from the SE on Mon afternoon, fresh winds from the NW by Tue night). | Days 5-7 Weather SummaryLight rain (total 2mm), mostly falling on Thu afternoon. Very mild (max 19°C on Wed night, min 15°C on Wed night). Mainly fresh winds. | ||||||||||||||||||
Monday 14 | Tuesday 15 | Wednesday 16 | Thursday 17 | Friday 18 | Saturday 19 | ||||||||||||||
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 10 | W 9 | W 9 | W 8 | WNW 8 | WNW 10 | WNW 10 | WNW 10 | WNW 11 | WNW 10 | W 10 | WNW 9 | WNW 10 | WNW 16 | WNW 13 | WNW 12 | WNW 11 | WNW 11 |
Wave Graph  | |||||||||||||||||||
 kJ | 222 | 157 | 106 | 76 | 69 | 116 | 378 | 416 | 551 | 561 | 363 | 440 | 397 | 535 | 1644 | 713 | 467 | 331 | 240 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | off | on | cross-on | cross-on | on | cross | cross | on | cross-on | on | on | cross-on | cross-on | on | on | cross-on | on | cross-on |
High Tide | 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 | 10:17AM2.91m | 11:10PM2.66m | |||||||
Low Tide | 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 | 5:31PM1.60m | |||||||
 | | |  | |  |  | | | | |  |  |  | | | | | | |
 | — | 7:48 | — | — | 7:48 | — | — | 7:50 | — | — | 7:52 | — | — | 7:52 | — | — | 7:54 | — | — |
 | 8:30 | — | 8:28 | — | — | 8:25 | — | — | 8:23 | — | — | 8:22 | — | — | 8:20 | — | — | 8:17 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | 1 | 1 | — | — | — | — | — | — |
Temp °C | 19 | 18 | 21 | 22 | 18 | 19 | 19 | 16 | 18 | 19 | 17 | 18 | 18 | 17 | 17 | 17 | 18 | 18 | 17 |
Feels °C | 17 | 18 | 20 | 20 | 15 | 16 | 12 | 13 | 12 | 12 | 13 | 13 | 13 | 13 | 13 | 12 | 17 | 16 | 16 |
Swell 1 Height (m) Direction Period (s) | WNW 10 | WNW 10 | W 9 | W 9 | W 8 | WNW 11 | — | WNW 10 | WNW 12 | WNW 11 | WNW 10 | WNW 10 | — | WNW 10 | WNW 16 | WNW 13 | WNW 12 | WNW 11 | WNW 11 |
| kJ | 222 | 157 | 106 | 76 | 69 | 68 | — | 416 | 226 | 561 | 363 | 223 | — | 490 | 1644 | 713 | 467 | 331 | 240 |
Swell 2 Height (m) Direction Period (s) | WNW 3 | NW 11 | NW 9 | WNW 10 | WNW 12 | W 8 | — | — | — | — | — | — | — | W 16 | — | — | — | — | — |
| kJ | 1 | 5 | 22 | 9 | 14 | 49 | — | — | — | — | — | — | — | 535 | — | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | W 13 | NW 9 | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | 4 | 3 | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | — | — | — | NW 3 | WNW 8 | WNW 10 | — | WNW 10 | — | W 4 | W 10 | WNW 9 | — | — | — | — | — | — |
| kJ | — | — | — | — | 2 | 116 | 378 | — | 551 | — | 6 | 440 | 397 | — | — | — | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 0 | 0 | 90 | 28 | 90 | 158 | 43 | 44 | 44 | 36 | 158 | 158 | 36 | 44 | 148 | 73 | 148 | 148 | 28 |
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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