Surf Forecasts:
Belle Ile - Les Donnants surf forecast from 6 Sep 2026:
- Best quality surf: Sunday 13 Sep, 2AM (local time) - 3.5ft (1.0m), 10s period, WNW swell with cross-offshore winds.
- Most powerful swell: Monday 7 Sep, 5PM (local time) - 5.5ft (1.7m), 13s period, W swell with 943 kJ wave energy.
- Next surfable swell (1★+): Thursday 10 Sep, 8AM (local time) - 2.5ft (0.8m), 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 Thursday (Sep 10) at 8AM. The primary swell is predicted to be 0.8m and 9s period with a secondary swell of 0.5m and 8s. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Belle Ile - Les Donnants in the next 16 days are 1.7m 13s and forecast to arrive on Monday (Sep 07) at 5PM. Winds are predicted to be onshore at the time the swell arrives.
| Wave Type | Time (CEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 8AM (Thu 10th Sep) | 2.5ft (0.8m) 9s |
| Best Surf | 2AM (Sun 13th Sep) | 3.5ft (1.0m) 10s |
| Most Powerful | 5PM (Mon 7th Sep) | 5.5ft (1.7m) 13s |
Table - best surf conditions forecast for Belle Ile - Les Donnants over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s have a look at what Belle Ile - Les Donnants has in store for us.
Right off the bat, I gotta be straight with you – it’s a bit of a rough start. The water is a touch warmer than normal for this time of year, coming in at 68°, which is a bit of a rare treat for the exposed river mouth, but the surf just isn’t cooperating for a while. The first decent window is tough to find. There’s a significant gap with no real recommendations from the start all the way through to Saturday the 12th of September. The swell mixes are messy, the winds are mostly onshore or cross-on, and the wave energy is low. You’re looking at nothing but poor conditions for days on end.
Now, the real standout for the entire outlook lands on Sunday the 13th of September. This is the one to circle. Sunday morning brings a clean 4ft swell from the WNW with a 9-second period, but the real magic is that offshore wind from the East at 6 mph. The wave energy is moderate. It’s going to be clean. Then Sunday afternoon gets even glassier with a slight air and a 3ft WNW swell at 10 seconds. This is your best bet. The wave energy drops a bit, but the conditions will be pure glass.
After that window, the energy picks up again, but the wind switches back onshore and the quality goes downhill. Monday the 21st of September late in the day shows a bigger 8ft swell from the WNW at 11 seconds – that’s a solid groundswell with strong wave energy. But the wind is onshore at 12 mph, making it marginal. This one is for experts only due to the size, but the onshore wind will mostly ruin the shape. Not a standout.
So, to sum it up: the first week is a wipeout. Wait for that Sunday the 13th. The morning will be clean with offshore wind, and the afternoon will be glassy. Anything else in the second week is a gamble with onshore winds ruining the potential.
Rusty.
Short Range ForecastLight rain (total 6mm), mostly falling on Tue morning. Warm (max 22°C on Sun afternoon, min 16°C on Tue night). Winds increasing (light winds from the WSW on Sun afternoon, strong winds from the SW by Tue morning). | Days 5-7 Weather SummaryMostly dry. Very mild (max 19°C on Fri afternoon, min 16°C on Wed night). Wind will be generally light. | |||||||||||||||||||
Sun 6 | Monday 7 | Tuesday 8 | Wednesday 9 | Thursday 10 | Friday 11 | Saturday 12 | ||||||||||||||
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 10 | WSW 18 | W 14 | W 13 | W 12 | WSW 11 | W 8 | WNW 9 | W 9 | WNW 8 | WNW 10 | WNW 9 | WNW 9 | WNW 8 | W 9 | W 9 | W 8 | W 8 | W 8 | WNW 10 |
Wave Graph  | ||||||||||||||||||||
 kJ | 98 | 102 | 919 | 943 | 699 | 749 | 615 | 727 | 363 | 177 | 168 | 53 | 52 | 78 | 251 | 215 | 125 | 94 | 99 | 201 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | on | on | on | on | cross-on | cross-on | cross-on | cross-on | on | cross-on | glassy | on | cross-on | cross-on | cross-on | cross-on | glassy | on | cross-off |
High Tide | 2:15AM3.19m | 2:44PM3.51m | 3:24AM3.49m | 3:44PM3.88m | 4:15AM3.81m | 4:31PM4.21m | 4:57AM4.06m | 5:11PM4.44m | 5:34AM4.23m | 5:49PM4.55m | 6:09AM4.31m | 6:23PM4.52m | ||||||||
Low Tide | 7:33PM1.10m | 8:05AM1.12m | 8:49PM0.81m | 9:11AM0.80m | 9:47PM0.46m | 10:04AM0.46m | 10:35PM0.15m | 10:49AM0.17m | 11:17PM-0.07m | 11:30AM-0.02m | 11:56PM-0.16m | 12:09PM-0.09m | 00:32AM-0.12m | |||||||
 |  |  | | |  |  |  | | | | | | | | | | | | | |
 | — | — | 7:37 | — | — | 7:39 | — | — | 7:41 | — | — | 7:41 | — | — | 7:43 | — | — | 7:45 | — | — |
 | 8:44 | — | — | 8:42 | — | — | 8:39 | — | — | 8:37 | — | — | 8:36 | — | — | 8:34 | — | — | 8:31 | — |
mm | — | — | — | — | — | 4 | 2 | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 22 | 21 | 20 | 19 | 18 | 18 | 18 | 18 | 17 | 17 | 17 | 16 | 17 | 17 | 18 | 19 | 19 | 18 | 19 | 20 |
Feels °C | 20 | 20 | 20 | 19 | 17 | 13 | 12 | 11 | 13 | 13 | 12 | 16 | 16 | 15 | 16 | 18 | 20 | 20 | 20 | 19 |
Swell 1 Height (m) Direction Period (s) | WNW 10 | W 9 | W 14 | W 13 | W 12 | W 11 | WSW 10 | WNW 9 | W 9 | WNW 8 | WNW 10 | W 8 | WNW 9 | WNW 8 | W 9 | W 9 | W 8 | W 8 | W 8 | WNW 10 |
| kJ | 98 | 39 | 919 | 943 | 699 | 573 | 35 | 727 | 363 | 177 | 168 | 40 | 52 | 78 | 251 | 215 | 125 | 94 | 99 | 201 |
Swell 2 Height (m) Direction Period (s) | SE 4 | WSW 18 | NW 9 | — | — | — | — | — | W 9 | W 9 | W 8 | WNW 9 | W 8 | W 8 | — | — | — | W 16 | W 15 | WNW 12 |
| kJ | 5 | 102 | 19 | — | — | — | — | — | 220 | 127 | 63 | 53 | 29 | 29 | — | — | — | 5 | 17 | 52 |
Swell 3 Height (m) Direction Period (s) | SE 4 | NW 9 | — | — | — | — | — | — | — | — | W 13 | W 12 | W 12 | WNW 11 | — | — | — | W 16 | W 12 | — |
| kJ | 5 | 21 | — | — | — | — | — | — | — | — | 3 | 11 | 11 | 38 | — | — | — | 5 | 3 | — |
Wind waves Height (m) Direction Period (s) | — | W 3 | W 9 | — | — | WSW 11 | W 8 | WNW 9 | — | — | — | — | — | — | — | — | — | — | — | WNW 4 |
| kJ | — | 5 | 96 | — | — | 749 | 615 | 560 | — | — | — | — | — | — | — | — | — | — | — | 7 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 101 | 36 | 148 | 147 | 44 | 159 | 323 | 43 | 44 | 90 | 28 | 0 | 101 | 101 | 101 | 44 | 35 | 0 | 101 | 0 |
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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