Surf Forecasts:
Belle Ile - Les Donnants surf forecast from 31 Jul 2026:
- Best quality surf: Monday 3 Aug, 2AM (local time) - 1.5ft (0.5m), 10s period, W swell with cross-offshore winds.
- Most powerful swell: Monday 3 Aug, 8PM (local time) - 3.5ft (1.1m), 9s period, W swell with 184 kJ wave energy.
- Next surfable swell (1★+): Monday 3 Aug, 2AM (local time) - 1.5ft (0.5m), 10s 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 Monday (Aug 03) at 2AM. The primary swell is predicted to be 0.5m and 10s period with a secondary swell of 0.4m and 4s. Another secondary swell of 0.3m and 3s is also forecast. 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 1.1m 9s and forecast to arrive on Monday (Aug 03) at 8PM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.9m 4s period and expected on Sunday (Aug 02) at 5AM.
| Wave Type | Time (CEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 2AM (Mon 3rd Aug) | 1.5ft (0.5m) 10s |
| Best Surf | 2AM (Mon 3rd Aug) | 1.5ft (0.5m) 10s |
| Most Powerful | 8PM (Mon 3rd Aug) | 3.5ft (1.1m) 9s |
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's comin' our way.
First things first, this is gonna be a tough stretch for anyone looking to get wet. The entire 16-day window is a real struggle. Don't expect much to ride.
We're looking at Belle Ile - Les Donnants, a river mouth that's exposed to the swell. The water is sitting at 68°, which is a touch warmer than normal for this time of year, so that's a little bonus.
The whole forecast is plagued by tiny surf and crummy winds. The first good sign we see is a long way off, on the morning of Saturday, the 8th of August. We get a bit of a pulse with a 3ft swell from the west, but it's a short period of 6 seconds, so it's all bumpy and weak. The combined energy is only 66 (weak), and the wind is from the NE at 9 mph, making it a cross-offshore breeze. It's surfable, but it's very ordinary. The afternoon on that same day gets blown out by a WNW wind.
The only real flicker of hope comes the next day, on Sunday, the 9th of August. The morning shows a 3ft swell from the west with a period of 9 seconds, and a clean easterly wind at 16 mph blowing straight offshore. The combined energy bumps up to 125 (moderate). That's a decent little window. Then, the afternoon turns glassy with a 3ft west swell and an 8-second period. The energy is 114 (moderate) and the wind is a perfect 3 mph from the SW, making it glassy. These two sessions on the 9th are the only real standouts, but it's still small, weak surf. It's a low expectation kind of day.
After that, it's back to the same old story. The morning of Tuesday, the 11th of August, has a clean 2ft swell from the west with a 10-second period, but the energy is a paltry 52 (weak). It's another one of those "surfable but very ordinary" days.
The rest of the forecast is a write-off. Onshore winds, tiny waves, and an overall feeling of frustration. This is a long, blank run. For a spot like this, it's a bit of a dry spell, but it happens. The forecasts can change, but right now, keep your board in the car and your expectations low.
Rusty.
Short Range ForecastMostly dry. Warm (max 26°C on Sun afternoon, min 15°C on Sat morning). Winds decreasing (fresh winds from the WNW on Fri afternoon, calm by Sun afternoon). | Days 4-6 Weather SummaryMostly dry. Warm (max 21°C on Tue morning, min 17°C on Wed night). Wind will be generally light. | ||||||||||||||||||||
Friday 31 | Saturday 1 | Sunday 2 | Monday 3 | Tuesday 4 | Wednesday 5 | Thursday 6 | |||||||||||||||
AM | 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 7 | WNW 4 | WNW 6 | W 10 | W 9 | W 9 | W 8 | W 8 | W 10 | W 8 | W 9 | W 8 | W 8 | WSW 8 | WSW 7 | WSW 7 | WSW 7 | W 7 | W 7 | W 7 | WNW 6 |
Wave Graph  | |||||||||||||||||||||
 kJ | 47 | 32 | 49 | 31 | 61 | 39 | 35 | 22 | 49 | 51 | 76 | 68 | 45 | 77 | 79 | 71 | 63 | 70 | 58 | 43 | 40 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | on | cross-off | cross-off | cross-on | cross-off | cross-off | cross-on | cross-off | on | on | on | cross-on | on | on | on | on | cross-on | cross | on | cross-off |
High Tide | 6:49PM4.14m | 7:06AM3.88m | 7:20PM4.15m | 7:38AM3.88m | 7:53PM4.10m | 8:12AM3.83m | 8:28PM4.00m | 8:49AM3.74m | 9:07PM3.83m | 9:32AM3.60m | 9:55PM3.62m | 10:25AM3.43m | 10:56PM3.39m | ||||||||
Low Tide | 12:45PM0.39m | 1:10AM0.32m | 1:18PM0.37m | 1:43AM0.33m | 1:53PM0.41m | 2:18AM0.39m | 2:29PM0.51m | 2:56AM0.51m | 3:10PM0.65m | 3:38AM0.68m | 3:58PM0.83m | 4:30AM0.88m | 4:58PM1.01m | ||||||||
 | |  | |  |  | | | | | | | | | | | | | | | | |
 | 6:48 | — | — | 6:50 | — | — | 6:50 | — | — | 6:52 | — | — | 6:54 | — | — | 6:54 | — | — | 6:56 | — | — |
 | — | — | 9:47 | — | — | 9:46 | — | — | 9:45 | — | — | 9:44 | — | — | 9:43 | — | — | 9:40 | — | — | 9:39 |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 17 | 19 | 21 | 17 | 20 | 21 | 19 | 26 | 25 | 20 | 20 | 20 | 21 | 21 | 21 | 20 | 21 | 21 | 17 | 20 | 24 |
Feels °C | 15 | 15 | 14 | 14 | 15 | 16 | 13 | 21 | 21 | 17 | 17 | 16 | 22 | 21 | 21 | 20 | 20 | 18 | 15 | 15 | 20 |
Swell 1 Height (m) Direction Period (s) | WNW 7 | W 12 | WNW 6 | W 10 | W 9 | W 9 | W 8 | W 8 | W 10 | W 8 | W 9 | W 8 | W 8 | WSW 8 | WSW 7 | WSW 7 | W 10 | W 10 | W 7 | W 10 | WNW 6 |
| kJ | 47 | 3 | 49 | 31 | 61 | 39 | 35 | 22 | 49 | 51 | 76 | 68 | 45 | 77 | 79 | 71 | 8 | 8 | 58 | 17 | 40 |
Swell 2 Height (m) Direction Period (s) | W 9 | W 12 | W 11 | WNW 7 | — | WNW 5 | WNW 7 | WSW 8 | NW 4 | W 10 | — | NW 7 | W 9 | W 9 | WSW 8 | — | — | — | W 10 | W 10 | W 10 |
| kJ | 6 | 3 | 10 | 17 | — | 9 | 4 | 7 | 5 | 8 | — | 2 | 27 | 27 | 6 | — | — | — | 19 | 18 | 17 |
Swell 3 Height (m) Direction Period (s) | — | — | W 9 | NW 7 | — | NW 7 | — | NNE 3 | NW 6 | — | — | — | W 3 | — | — | — | — | — | W 11 | — | W 10 |
| kJ | — | — | 6 | 8 | — | 2 | — | 1 | 2 | — | — | — | 1 | — | — | — | — | — | 9 | — | 17 |
Wind waves Height (m) Direction Period (s) | NNE 3 | WNW 4 | NNE 4 | NNE 3 | NW 3 | NE 4 | ENE 4 | WNW 6 | N 3 | WNW 6 | W 4 | WNW 4 | — | — | — | — | WSW 7 | W 7 | — | W 7 | — |
| kJ | 3 | 32 | 11 | 7 | 3 | 21 | 13 | 4 | 1 | 4 | 9 | 9 | — | — | — | — | 63 | 70 | — | 43 | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 90 | 1251 | 116 | 20 | 36 | 119 | 277 | 346 | 0 | 87 | 359 | 43 | 101 | 101 | 101 | 90 | 338 | 36 | 28 | 43 | 459 |
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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