Surf Forecasts:
Belle Ile - Les Donnants surf forecast from 30 Aug 2026:
- Best quality surf: Tuesday 1 Sep, 5AM (local time) - 5ft (1.5m), 10s period, W swell with cross-offshore winds.
- Most powerful swell: Monday 31 Aug, 8AM (local time) - 8ft (2.5m), 10s period, W swell with 1,273 kJ wave energy.
- Next surfable swell (1★+): Tuesday 1 Sep, 5AM (local time) - 5ft (1.5m), 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 Tuesday (Sep 01) at 5AM. The primary swell is predicted to be 1.5m and 10s period. 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 2.5m 10s and forecast to arrive on Monday (Aug 31) at 8AM. Winds are predicted to be 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 Sunday (Sep 06) at 8AM.
| Wave Type | Time (CEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 5AM (Tue 1st Sep) | 5ft (1.5m) 10s |
| Best Surf | 5AM (Tue 1st Sep) | 5ft (1.5m) 10s |
| Most Powerful | 8AM (Mon 31st Aug) | 8ft (2.5m) 10s |
Table - best surf conditions forecast for Belle Ile - Les Donnants over the next 16 days.
The Lowdown
Alright, Rusty here. Let’s talk about what’s happening at Belle Ile - Les Donnants.
Right now, the water temp is sitting at 67°, which is about 2° warmer than usual for this time of year – nothing wild, just a touch on the mild side.
The honest truth is this stretch starts out pretty grim. The first few days are a real write-off. Sunday the 30th and Monday the 1st are blown out with onshore winds and messy conditions; the swell energy Monday morning hits 1203 (moderate to strong), but it’s all ruined by a strong onshore flow. Tuesday the 1st of September is where we finally get a window. Tuesday morning is the standout early in the period. The wind goes glassy out of the northeast at just 3 mph, and we’ve got a clean 4ft swell rolling in from the west with a 10-second period. The combined energy is moderate at 306. It’s not a massive day, but it’s clean, it’s surfable, and for a river setup like Les Donnants, that’s gold. Crowds can be an issue here often, so if you’re keen, get on it early Tuesday.
After that, the surf drops off hard. Wednesday the 2nd and Thursday the 3rd are tiny – under 3ft – and winds aren't doing us any favours. Friday the 4th picks up to 5ft but it’s onshore and messy again. There’s a bit of hope on the 5th of September (Saturday morning) with a cross-shore wind and 5ft from the WNW at 12 seconds, but the forecast calls it marginal – a bit of a gamble.
We then hit a gap of a few days with only small, ordinary waves until Monday afternoon the 7th of September. That’s another decent call: glassy conditions, 4ft west swell at 10 seconds, and clean. Then things get proper again on Saturday the 12th of September. The morning is clean with 7ft from the WNW at 10 seconds, cross-off wind, and solid energy. The afternoon goes glassy with 5ft. This is your pick of the second week – good shape, clean, and consistent.
The following morning on Sunday the 13th brings a 10ft swell from the west with 10-second period and offshore wind, but the file flags it as too big for this break. That’s expert-only territory, and even then, it might be a washing machine. Best to watch that one from the beach.
So, the honest call: the whole window is a bit of a slow burner. Tuesday the 1st morning is your best early bet, and Saturday the 12th is the real standout for the second week. Don’t get your hopes up for the rest – it’s mostly a waiting game.
Rusty.
Short Range ForecastLight rain (total 2mm), mostly falling on Sun morning. Warm (max 20°C on Sun morning, min 16°C on Mon night). Winds decreasing (strong winds from the WSW on Sun night, calm by Tue afternoon). | Days 4-6 Weather SummaryMostly dry. Warm (max 20°C on Thu night, min 16°C on Fri night). Winds increasing (calm on Wed morning, fresh winds from the WNW by Fri afternoon). | ||||||||||||||||||||
Sunday 30 | Monday 31 | Tuesday 1 | Wednesday 2 | Thursday 3 | Friday 4 | Saturday 5 | |||||||||||||||
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) | W 9 | WSW 8 | W 9 | W 10 | W 10 | W 10 | W 10 | W 9 | W 9 | WNW 8 | W 8 | WNW 8 | WNW 8 | WNW 8 | WNW 8 | WNW 11 | WNW 11 | WNW 13 | WNW 12 | WNW 11 | WNW 10 |
Wave Graph  | |||||||||||||||||||||
 kJ | 340 | 521 | 1033 | 1203 | 867 | 561 | 306 | 165 | 74 | 51 | 33 | 83 | 151 | 171 | 207 | 408 | 551 | 1058 | 521 | 331 | 184 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | on | on | on | on | cross | glassy | on | cross | cross-on | on | on | on | on | on | on | on | cross-on | cross | on | cross-off |
High Tide | 6:53PM4.36m | 7:10AM4.16m | 7:26PM4.29m | 7:44AM4.09m | 8:01PM4.13m | 8:21AM3.94m | 8:41PM3.88m | 9:03AM3.71m | 9:30PM3.56m | 9:58AM3.44m | 10:37PM3.24m | 11:18AM3.21m | 00:24AM3.05m | ||||||||
Low Tide | 12:50PM0.13m | 1:12AM0.09m | 1:25PM0.17m | 1:47AM0.19m | 2:02PM0.30m | 2:25AM0.39m | 2:44PM0.51m | 3:09AM0.65m | 3:34PM0.77m | 4:03AM0.96m | 4:39PM1.03m | 5:14AM1.21m | 6:02PM1.18m | ||||||||
 |  |  |  | |  |  | | | | | | | | | | | | | | | |
 | 7:28 | — | — | 7:28 | — | — | 7:31 | — | — | 7:31 | — | — | 7:33 | — | — | 7:33 | — | — | 7:35 | — | — |
 | — | 8:58 | — | — | 8:55 | — | — | 8:53 | — | — | 8:52 | — | — | 8:50 | — | — | 8:47 | — | — | 8:45 | — |
mm | 1 | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 20 | 19 | 19 | 19 | 18 | 18 | 16 | 17 | 18 | 17 | 18 | 18 | 19 | 19 | 20 | 19 | 18 | 17 | 15 | 17 | 18 |
Feels °C | 17 | 14 | 13 | 15 | 15 | 14 | 15 | 15 | 15 | 18 | 17 | 17 | 18 | 18 | 19 | 16 | 14 | 11 | 12 | 14 | 14 |
Swell 1 Height (m) Direction Period (s) | W 9 | — | — | W 10 | W 10 | W 10 | W 10 | W 9 | W 9 | WNW 8 | W 8 | WNW 8 | WNW 8 | WNW 8 | WNW 8 | WNW 11 | W 19 | WNW 13 | WNW 12 | WNW 11 | WNW 10 |
| kJ | 340 | — | — | 1203 | 867 | 561 | 306 | 165 | 74 | 51 | 33 | 83 | 151 | 171 | 207 | 408 | 7 | 1058 | 521 | 331 | 184 |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | NW 3 | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | 6 | — | — | — | — | — | — | — | — | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | SW 7 | WSW 8 | W 9 | — | — | — | — | — | NW 3 | — | — | — | — | — | — | — | WNW 11 | — | — | — | ENE 2 |
| kJ | 102 | 521 | 1033 | — | — | — | — | — | 6 | — | — | — | — | — | — | — | 551 | — | — | — | 1 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 155 | 259 | 426 | 93 | 93 | 20 | 0 | 101 | 28 | 119 | 101 | 90 | 101 | 148 | 73 | 429 | 202 | 43 | 28 | 158 | 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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