
Surf Forecasts:
Belle Ile - Les Donnants surf forecast from 30 Jul 2026:
- Most powerful swell: Friday 31 Jul, 5PM (local time) - 3ft (0.9m), 8s period, WNW swell with 98 kJ wave energy.
Best Forecast Surf Conditions for Belle Ile - Les Donnants this week:
The most powerful waves expected at Belle Ile - Les Donnants in the next 16 days are 0.9m 8s and forecast to arrive on Friday (Jul 31) at 5PM. 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 2AM.
| Wave Type | Time (CEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 5PM (Fri 31st Jul) | 3ft (0.9m) 8s |
Table - best surf conditions forecast for Belle Ile - Les Donnants over the next 16 days.
The Lowdown
Alright, let’s talk about Belle Ile – Les Donnants. For the next 16 days, there’s a long dry spell before anything worth mentioning. The first real action doesn’t show up until Saturday, August 8th.
For the first week-plus, it’s almost flat. Waist-high slop at best, with the combined swell energy staying weak, mostly under 100. The wind is all over the place, mostly onshore or cross-onshore, so don’t expect any sort of shape. The morning of August 1st looks clean with a light cross-offshore breeze, but the swell is a tiny 1ft from the west with a period of 10 seconds. It’s just not enough to get out of bed for. You’d be better off doing something else.
Now, Saturday, August 8th morning is the one to look at. The combined swell energy jumps up to 921, which is moderate to strong energy. We’re seeing a solid 8ft swell from the WSW, but here’s the thing – the period is only 8 seconds. That’s a short period, not a classic groundswell. For a river break like Les Donnants, anything over 8ft is expert territory only. The wind is a gentle cross-onshore from the NW, which will keep it a bit bumpy. It’s not glassy, but the size is there for the crew who can handle a big, chunky closeout. Later that day, it goes onshore and the energy hits 1010, but the quality drops right off.
After that little pulse, it’s back to tiny, weak conditions for the rest of the outlook. Sunday the 9th has a 5ft swell but with a cross-shore wind and a lot of chop, so it’s not inviting. The following week is all small surf again, with winds swinging around. The mornings of August 13th and 14th do look clean with a cross-offshore breeze, but the swell is only 1ft and 2ft – barely a ripple. Honestly, that Saturday the 8th is your one and only shot at anything with power, and it’s for experts only. For the rest of us, it’s a long stretch of flat and poor conditions.
Rusty.
Short Range ForecastMostly dry. Warm (max 21°C on Thu night, min 15°C on Fri night). Winds decreasing (fresh winds from the WNW on Fri night, light winds from the WNW by Sat afternoon). | Days 5-7 Weather SummaryLight rain (total 2mm), mostly falling on Mon night. Warm (max 26°C on Sun afternoon, min 17°C on Sat night). Winds decreasing (fresh winds from the NNE on Sat night, light winds from the NE by Sun afternoon). | ||||||||||||||||||
Thursday 30 | Friday 31 | Saturday 1 | Sunday 2 | Monday 3 | Tuesday 4 | ||||||||||||||
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 8 | WNW 8 | WNW 8 | NW 5 | WNW 7 | WNW 8 | WNW 5 | W 10 | W 9 | W 9 | W 8 | W 8 | W 8 | W 9 | W 8 | W 8 | W 8 | WSW 8 | WSW 7 |
Wave Graph | |||||||||||||||||||
117 | 40 | 51 | 25 | 21 | 98 | 36 | 31 | 61 | 39 | 35 | 23 | 36 | 59 | 86 | 48 | 42 | 44 | 41 | |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | on | cross | cross | on | cross-off | cross-off | on | cross-off | cross-off | cross-on | cross | on | on | cross-on | cross-on | cross-on | on |
High Tide | 6:04AM3.75m | 6:18PM4.06m | 6:35AM3.84m | 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 | |||||||
Low Tide | 00:01AM0.49m | 12:11PM0.48m | 00:36AM0.38m | 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 | ||||||
— | 6:48 | — | — | 6:48 | — | — | 6:50 | — | — | 6:50 | — | — | 6:52 | — | — | 6:54 | — | — | |
9:51 | — | — | 9:50 | — | — | 9:47 | — | — | 9:46 | — | — | 9:45 | — | — | 9:44 | — | — | 9:43 | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | 1 | — | — |
Temp °C | 20 | 17 | 19 | 21 | 17 | 19 | 21 | 17 | 20 | 22 | 19 | 26 | 24 | 20 | 20 | 20 | 21 | 20 | 20 |
Feels °C | 19 | 16 | 18 | 17 | 14 | 13 | 14 | 13 | 15 | 17 | 13 | 20 | 21 | 17 | 15 | 18 | 21 | 17 | 19 |
Swell 1 Height (m) Direction Period (s) | WNW 10 | WNW 8 | W 10 | NW 5 | WNW 7 | W 12 | WNW 5 | W 10 | W 9 | W 9 | W 8 | W 8 | WNW 5 | W 9 | — | W 8 | W 8 | WSW 8 | WSW 7 |
20 | 40 | 17 | 25 | 21 | 3 | 36 | 31 | 61 | 39 | 35 | 23 | 15 | 59 | — | 48 | 42 | 44 | 41 | |
Swell 2 Height (m) Direction Period (s) | — | W 10 | WNW 10 | WNW 8 | W 9 | W 12 | WNW 8 | NW 6 | — | WNW 6 | WNW 7 | WSW 8 | W 8 | NW 6 | — | — | WNW 3 | W 9 | W 9 |
— | 8 | 19 | 25 | 6 | 3 | 6 | 10 | — | 12 | 4 | 7 | 36 | 2 | — | — | 2 | 7 | 6 | |
Swell 3 Height (m) Direction Period (s) | — | SW 5 | — | W 10 | — | — | W 11 | NW 7 | — | — | — | — | WSW 8 | W 6 | — | — | — | W 6 | NW 5 |
— | 1 | — | 8 | — | — | 10 | 8 | — | — | — | — | 6 | 1 | — | — | — | 1 | 1 | |
Wind waves Height (m) Direction Period (s) | WNW 8 | WNW 3 | WNW 8 | NNE 3 | NNW 4 | WNW 8 | NE 4 | NNE 4 | NW 3 | NE 4 | ENE 4 | NW 3 | NNE 3 | NNW 3 | W 8 | WNW 5 | — | W 3 | — |
117 | 1 | 51 | 1 | 13 | 98 | 10 | 8 | 2 | 28 | 10 | 3 | 4 | 2 | 86 | 36 | — | 1 | — | |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 49 | 90 | 158 | 118 | 90 | 343 | 116 | 20 | 350 | 148 | 225 | 356 | 30 | 336 | 287 | 101 | 341 | 333 | 529 |
Best forecast wave conditions in Morbihan - Brittany | |||||||||||||||||||
Best forecast wave conditions in France | |||||||||||||||||||
Header Global | |||||||||||||||||||
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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.










