Surf Forecasts:
Belle Ile - Les Donnants surf forecast from 8 Sep 2026:
- Best quality surf: Sunday 13 Sep, 8AM (local time) - 3.5ft (1.1m), 12s period, WNW swell with cross-offshore winds.
- Most powerful swell: Tuesday 8 Sep, 8PM (local time) - 8ft (2.4m), 9s period, W swell with 909 kJ wave energy.
- Next surfable swell (1★+): Thursday 10 Sep, 5AM (local time) - 3ft (0.9m), 9s period with NW 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 5AM. The primary swell is predicted to be 0.9m and 9s period with a secondary swell of 0.6m and 8s. 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 2.4m 9s and forecast to arrive on Tuesday (Sep 08) at 8PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.5m 3s period and expected on Tuesday (Sep 15) at 8AM.
| Wave Type | Time (CEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 5AM (Thu 10th Sep) | 3ft (0.9m) 9s |
| Best Surf | 8AM (Sun 13th Sep) | 3.5ft (1.1m) 12s |
| Most Powerful | 8PM (Tue 8th Sep) | 8ft (2.4m) 9s |
Table - best surf conditions forecast for Belle Ile - Les Donnants over the next 16 days.
The Lowdown
Alright, Rusty here. Let's chew the fat on this 16-day stretch.
Pretty quiet run overall. The first couple days are a mess with strong winds and blown-out conditions. The one bright spot that stands out comes on the morning of Sunday, the 13th.
Belle Ile - Les Donnants will be worth a paddle. Glassy conditions, dead calm, and a clean 4ft swell out of the WNW with a period of 11 seconds. That’s a nice little groundswell with some shape. The combined swell energy hits at 303, which is moderate – enough to get into. The water is a touch warmer than average for September, sitting at about 68°F.
Thursday morning the 10th is clean but tiny, with just a 2ft wave.
Monday morning the 14th is also a good call. Clean offshore breeze from the ENE with a 3ft WNW swell at 10 seconds.
The second week goes flat and drab. The only flicker is the morning of Wednesday the 23rd, a long way out, with a solid 3ft swell from the W at a very long 16-second period. The combined energy jumps to 577. The winds are strong and clean, but that period is so long it might race through this river break, and it’s far out in the forecast. A bit of a promise you shouldn’t bank on.
Nothing to get too amped about. Hit the water Sunday the 13th or Monday the 14th for your cleanest windows.
Rusty.
Short Range ForecastLight rain (total 2mm), mostly falling on Tue afternoon. Very mild (max 19°C on Tue afternoon, min 15°C on Wed night). Winds decreasing (strong winds from the NW on Tue afternoon, light winds from the SSW by Thu afternoon). | Days 5-7 Weather SummaryMostly dry. Warm (max 21°C on Sun night, min 15°C on Sat morning). Winds decreasing (fresh winds from the NNE on Fri night, calm by Sat afternoon). | |||||||||||||||||||
Tue 8 | Wednesday 9 | Thursday 10 | Friday 11 | Saturday 12 | Sunday 13 | Monday 14 | ||||||||||||||
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) | W 9 | W 9 | W 9 | WNW 9 | NW 10 | WNW 9 | WNW 8 | W 8 | W 10 | WNW 9 | W 9 | W 8 | W 15 | WNW 10 | WNW 11 | WNW 10 | WNW 10 | WNW 10 | WNW 9 | W 9 |
Wave Graph  | ||||||||||||||||||||
 kJ | 1080 | 575 | 363 | 203 | 181 | 53 | 41 | 55 | 423 | 333 | 186 | 105 | 112 | 167 | 303 | 281 | 255 | 157 | 110 | 73 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | cross-on | cross-on | cross-off | off | cross-on | on | cross | on | cross-off | glassy | on | cross | glassy | on | cross-off | off | on | cross-off |
High Tide | 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 | 6:41AM4.28m | 6:55PM4.39m | 7:11AM4.18m | 7:26PM4.16m | |||||||
Low Tide | 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 | 12:46PM-0.04m | 1:08AM0.03m | 1:23PM0.13m | 1:43AM0.28m | |||||||
 |  |  | |  |  | | | | | | | | | | | | | | | |
 | — | — | 7:41 | — | — | 7:41 | — | — | 7:43 | — | — | 7:45 | — | — | 7:46 | — | — | 7:48 | — | — |
 | 8:39 | — | — | 8:37 | — | — | 8:36 | — | — | 8:34 | — | — | 8:31 | — | — | 8:30 | — | — | 8:28 | — |
mm | 1 | — | — | — | — | — | — | — | 1 | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 19 | 18 | 16 | 18 | 18 | 15 | 17 | 18 | 19 | 20 | 20 | 15 | 17 | 19 | 18 | 19 | 21 | 19 | 23 | 24 |
Feels °C | 10 | 11 | 12 | 14 | 13 | 13 | 15 | 15 | 18 | 17 | 14 | 14 | 15 | 16 | 17 | 17 | 18 | 19 | 23 | 23 |
Swell 1 Height (m) Direction Period (s) | — | W 9 | W 9 | WNW 9 | NW 10 | WNW 9 | WNW 8 | NW 8 | W 10 | WNW 9 | W 9 | W 8 | WNW 8 | WNW 10 | WNW 11 | WNW 10 | WNW 10 | WNW 10 | WNW 9 | W 9 |
| kJ | — | 575 | 363 | 203 | 181 | 53 | 41 | 17 | 423 | 333 | 186 | 105 | 112 | 167 | 303 | 281 | 255 | 157 | 110 | 73 |
Swell 2 Height (m) Direction Period (s) | — | — | W 9 | WSW 8 | W 8 | W 8 | WSW 8 | WNW 11 | — | — | — | W 16 | W 15 | WNW 13 | — | — | — | NW 10 | WNW 9 | WNW 10 |
| kJ | — | — | 181 | 92 | 64 | 46 | 19 | 24 | — | — | — | 21 | 109 | 93 | — | — | — | 110 | 58 | 9 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | W 13 | W 12 | W 12 | W 13 | — | — | — | — | W 12 | — | — | — | — | — | — | W 14 |
| kJ | — | — | — | — | 3 | 11 | 3 | 4 | — | — | — | — | 3 | — | — | — | — | — | — | 4 |
Wind waves Height (m) Direction Period (s) | W 9 | — | — | — | — | — | — | W 8 | — | — | NE 3 | — | — | — | — | W 3 | — | — | — | — |
| kJ | 1080 | — | — | — | — | — | — | 55 | — | — | 2 | — | — | — | — | 1 | — | — | — | — |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 373 | 44 | 36 | 36 | 28 | 0 | 101 | 101 | 28 | 90 | 28 | 0 | 101 | 28 | 0 | 148 | 0 | 0 | 81 | 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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