Surf Forecasts:
Belle Ile - Les Donnants surf forecast from 25 Aug 2026:
- Best quality surf: Wednesday 26 Aug, 5PM (local time) - 1.5ft (0.5m), 9s period, W swell with offshore winds.
- Most powerful swell: Saturday 29 Aug, 5PM (local time) - 10ft (3.0m), 8s period, WSW swell with 1,287 kJ wave energy.
- Next surfable swell (1★+): Wednesday 26 Aug, 5PM (local time) - 1.5ft (0.5m), 9s period with W 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 Wednesday (Aug 26) at 5PM. The primary swell is predicted to be 0.7m and 6s period with a secondary swell of 0.5m and 9s. 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 3.0m 8s and forecast to arrive on Saturday (Aug 29) at 5PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.4m 3s period and expected on Wednesday (Aug 26) at 5PM.
| Wave Type | Time (CEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 5PM (Wed 26th Aug) | 1.5ft (0.5m) 9s |
| Best Surf | 5PM (Wed 26th Aug) | 1.5ft (0.5m) 9s |
| Most Powerful | 5PM (Sat 29th Aug) | 10ft (3.0m) 8s |
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 Belle Ile - Les Donnants has in store for us.
Honestly, the outlook for the next sixteen days is a tough one. We’ve got a long stretch of messy, blown-out conditions to sit through before anything worth paddling out for shows up. It’s a real test of patience.
The first solid recommendation doesn’t come until Sunday morning, the 6th of September. That morning, we get a clean window with a light cross-offshore breeze from the SE at 6 mph. Swell is from the WNW at 6 ft with an 11-second period. The combined energy is strong at 711. That’s the standout in the whole run. The water is about average for the time of year. It’s a river break, exposed to SW swell, so it handles that. The winds will be clean, making for some decent, lined-up waves. Crowds can be likely, so get in early.
Before that, we have to deal with over a week of nothing good. From the 25th of August right through to the afternoon of the 5th of September, the surf is mostly poor. On the 28th, we get a 7 ft onshore blast from the WNW (843 energy), but it’s all onshore wind and messy. The 29th and 31st see bigger swell, up to 8 ft and 10 ft, with strong cross-onshore winds making it a washing machine. That is more for kite surfing than paddle surfing. The period is short, so it’s just lumpy and raw.
Sunday afternoon on the 6th of September still has clean conditions from the SSE, but the fresh 19 mph cross-offshore breeze makes it tricky. Swell sits at 5 ft (595 energy). It’s not the morning, but worth checking if the wind eases.
Beyond that, we’re into Monday the 7th and Tuesday the 8th of September. On the 8th, there’s a massive 10 ft swell from the W with a 14-second period (3697 energy) – that is a very long period groundswell. But it’s all onshore wind, so it’s only going to look huge and ugly. Best left to the experts, and even then, it’s a messy one.
So, the window is tight. Sunday morning the 6th is your best bet for clean, surfable waves. Everything before that is a write-off. Be on it.
Rusty.
Short Range ForecastModerate rain (total 11mm), heaviest on Wed afternoon. Warm (max 20°C on Mon night, min 19°C on Mon night). Wind will be generally light. | Days 5-7 Weather SummaryHeavy rain (total 22mm), heaviest during Fri morning. Warm (max 20°C on Sun afternoon, min 17°C on Fri morning). Mainly strong winds. | ||||||||||||||||||
Tuesday 25 | Wednesday 26 | Thursday 27 | Friday 28 | Saturday 29 | Sunday 30 | ||||||||||||||
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) | WSW 9 | SW 8 | WNW 11 | SW 6 | SW 6 | W 9 | SW 6 | WSW 8 | WSW 8 | WSW 7 | SW 7 | W 10 | W 8 | WSW 7 | WSW 8 | WSW 8 | W 8 | W 7 | W 8 |
Wave Graph  | |||||||||||||||||||
 kJ | 30 | 33 | 22 | 42 | 46 | 43 | 30 | 232 | 238 | 114 | 77 | 843 | 610 | 684 | 1287 | 446 | 187 | 181 | 163 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross-on | cross-on | cross-on | cross-off | off | cross-on | cross-on | cross-on | cross-on | cross-on | on | on | cross-on | cross-on | on | cross-on | cross-on | on |
High Tide | 4:08AM3.25m | 4:21PM3.56m | 4:40AM3.50m | 4:52PM3.83m | 5:10AM3.73m | 5:22PM4.06m | 5:39AM3.92m | 5:52PM4.24m | 6:09AM4.06m | 6:22PM4.34m | 6:39AM4.15m | 6:53PM4.36m | |||||||
Low Tide | 9:41PM1.11m | 9:56AM1.03m | 10:24PM0.82m | 10:35AM0.75m | 11:00PM0.55m | 11:11AM0.50m | 11:34PM0.32m | 11:44AM0.30m | 00:07AM0.16m | 12:17PM0.18m | 00:39AM0.08m | 12:50PM0.13m | 1:12AM0.09m | ||||||
 |  |  |  |  |  |  |  | | |  | |  | | | | | | | |
 | — | 7:20 | — | — | 7:22 | — | — | 7:24 | — | — | 7:24 | — | — | 7:26 | — | — | 7:28 | — | — |
 | 9:08 | — | — | 9:07 | — | — | 9:05 | — | — | 9:02 | — | — | 9:01 | — | — | 9:00 | — | 8:58 | — |
mm | 1 | — | — | — | — | 4 | 5 | 1 | — | 5 | 8 | 3 | — | — | 6 | — | — | — | — |
Temp °C | 20 | 19 | 20 | 20 | 19 | 19 | 20 | 19 | 19 | 19 | 18 | 19 | 19 | 19 | 19 | 19 | 19 | 20 | 20 |
Feels °C | 20 | 18 | 20 | 19 | 19 | 17 | 20 | 18 | 19 | 16 | 14 | 19 | 11 | 16 | 14 | 15 | 17 | 18 | 16 |
Swell 1 Height (m) Direction Period (s) | S 6 | SW 8 | SW 8 | SW 5 | SW 6 | SW 6 | WNW 8 | WSW 8 | WSW 8 | W 8 | W 8 | — | W 8 | — | — | WSW 8 | W 8 | W 7 | W 12 |
| kJ | 17 | 33 | 16 | 23 | 46 | 43 | 21 | 232 | 238 | 49 | 49 | — | 610 | — | — | 446 | 187 | 181 | 3 |
Swell 2 Height (m) Direction Period (s) | WSW 9 | WNW 11 | WNW 11 | WNW 10 | W 9 | W 9 | SSE 4 | W 12 | NW 11 | WNW 10 | NW 9 | — | — | — | — | — | SW 7 | — | W 12 |
| kJ | 30 | 13 | 22 | 38 | 41 | 39 | 3 | 3 | 5 | 20 | 23 | — | — | — | — | — | 73 | — | 3 |
Swell 3 Height (m) Direction Period (s) | W 9 | W 8 | S 4 | W 4 | — | — | — | — | — | — | W 12 | — | — | — | — | — | — | — | — |
| kJ | 2 | 1 | 1 | 4 | — | — | — | — | — | — | 25 | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | SSW 5 | WSW 3 | SW 6 | — | SE 3 | SW 6 | — | — | WSW 7 | SW 7 | W 10 | — | WSW 7 | WSW 8 | — | — | — | W 8 |
| kJ | — | 8 | 4 | 42 | — | 4 | 30 | — | — | 114 | 77 | 843 | — | 684 | 1287 | — | — | — | 163 |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 90 | 101 | 101 | 101 | 30 | 0 | 158 | 118 | 121 | 117 | 101 | 43 | 148 | 259 | 148 | 44 | 101 | 436 | 426 |
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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