Surf Forecasts:
Belle Ile - Les Donnants surf forecast from 3 Aug 2026:
- Most powerful swell: Wednesday 5 Aug, 8PM (local time) - 4.5ft (1.4m), 8s period, WNW swell with 251 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 1.4m 8s and forecast to arrive on Wednesday (Aug 05) 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 0.7m 4s period and expected on Monday (Aug 10) at 5AM.
| Wave Type | Time (CEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 8PM (Wed 5th Aug) | 4.5ft (1.4m) 8s |
Table - best surf conditions forecast for Belle Ile - Les Donnants over the next 16 days.
The Lowdown
Alright crew, Rusty here again, giving you the imperial rundown for Belle Ile - Les Donnants.
It’s a rough patch, I ain't gonna lie. The entire 16-day window is full of dud surf, with the first real chance not coming until Monday, the 17th of August. Before that, it’s a mess of tiny waves and bad wind. The combined swell energy is weak, mostly below 100. For example, you’re looking at 57 (on the 3rd), 153 (on the 4th), and 169 (on the 4th afternoon), but it’s all choppy and cross-on. Not good.
The first real standout is Monday morning, the 17th of August. We’ve got a 0.9m (3 ft) swell from the WNW, with a bit of energy (125). The wind is a cross-on moderate breeze, so it’s not perfect, but it’s the first pulse. The morning of Tuesday, the 18th of August, is cleaner. A 0.4m (1 ft) swell from the NW with a light cross-offshore breeze from the ENE. That’s glassy. The energy is low (30), but you can paddle.
But the real standout is the morning of the 9th of August. The swell is tiny, only 0.4m (1 ft) from the WNW, but the wind is offshore from the E at 12 mph. That’s clean, glassy surf. The combined energy is weak (38), so it’s a longboard special. The water temperature is about 68°F, which is normal for this time of year.
The rest of the period is mostly 0.6 ft to 2 ft slop with onshore winds. The 7th and 8th of August have a clean cross-offshore wind, but the swell is a paltry 0.2m (0.6 ft) to 0.3m (1 ft). The 12th of August has a light cross-offshore breeze and a 0.2m (0.6 ft) swell. The 13th of August has a clean cross-offshore and a 0.5m (2 ft) swell, but energy is low (37). It’s a maybe.
Best on offer? The 9th of August morning for the cleanest, glassiest conditions, even if it’s tiny. The 17th of August for the most size. For a true standout, I’d say the 9th of August is the one to hunt if you’ve got a log. The 17th of August is the one for a bit of juice.
Remember, Belle Ile - Les Donnants is a river break, consistent, and exposed to SW swell. The optimum swell is from the SW, and the crowds are often there.
Rusty, out.
Short Range ForecastMostly dry. Warm (max 21°C on Mon afternoon, min 15°C on Thu morning). Winds decreasing (fresh winds from the WNW on Wed night, light winds from the NNW by Thu morning). | Days 5-7 Weather SummaryMostly dry. Warm (max 27°C on Sat night, min 14°C on Fri morning). Winds decreasing (strong winds from the WNW on Thu night, calm by Fri afternoon). | |||||||||||||||||||
Mon 3 | Tuesday 4 | Wednesday 5 | Thursday 6 | Friday 7 | Saturday 8 | Sunday 9 | ||||||||||||||
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 8 | W 8 | WSW 7 | WSW 7 | W 7 | W 8 | WNW 7 | WNW 7 | WNW 7 | WNW 5 | W 10 | W 9 | W 9 | W 9 | WNW 11 | NW 10 | WNW 9 | WNW 9 | WNW 5 |
Wave Graph  | ||||||||||||||||||||
 kJ | 54 | 68 | 153 | 143 | 121 | 124 | 217 | 193 | 49 | 47 | 24 | 16 | 15 | 15 | 6 | 11 | 24 | 32 | 31 | 34 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | on | cross-on | cross-on | on | on | on | cross | cross | on | cross-off | cross-off | cross-on | cross-off | cross-off | cross-on | cross-off | off | cross-on | cross-on |
High Tide | 8:28PM4.00m | 8:49AM3.74m | 9:07PM3.83m | 9:32AM3.60m | 9:55PM3.62m | 10:25AM3.43m | 10:56PM3.39m | 11:36AM3.29m | 00:22AM3.23m | 1:10PM3.29m | 2:02AM3.29m | 2:40PM3.50m | 3:21AM3.52m | |||||||
Low Tide | 2:29PM0.51m | 2:56AM0.51m | 3:10PM0.65m | 3:38AM0.68m | 3:58PM0.83m | 4:30AM0.88m | 4:58PM1.01m | 5:35AM1.06m | 6:13PM1.11m | 6:52AM1.14m | 7:35PM1.04m | 8:10AM1.03m | 8:51PM0.81m | |||||||
 |  |  | | | | | | | | | | | | | | | | |  | |
 | — | — | 6:54 | — | — | 6:54 | — | — | 6:56 | — | — | 6:58 | — | — | 6:58 | — | — | 7:00 | — | — |
 | — | 9:44 | — | — | 9:43 | — | — | 9:40 | — | — | 9:39 | — | — | 9:37 | — | — | 9:37 | — | — | 9:35 |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 21 | 20 | 20 | 21 | 20 | 18 | 18 | 18 | 15 | 18 | 20 | 15 | 20 | 21 | 18 | 26 | 27 | 21 | 26 | 22 |
Feels °C | 18 | 18 | 19 | 20 | 18 | 15 | 15 | 12 | 12 | 13 | 12 | 13 | 16 | 16 | 15 | 23 | 21 | 16 | 24 | 20 |
Swell 1 Height (m) Direction Period (s) | W 9 | W 8 | W 8 | W 9 | W 8 | W 8 | — | W 10 | WNW 7 | W 10 | WNW 5 | NW 6 | WNW 6 | NW 4 | W 9 | WNW 11 | NW 10 | WNW 9 | WNW 9 | WNW 5 |
| kJ | 54 | 68 | 153 | 26 | 23 | 5 | — | 8 | 49 | 17 | 24 | 9 | 7 | 4 | 6 | 11 | 24 | 32 | 31 | 34 |
Swell 2 Height (m) Direction Period (s) | NW 6 | — | — | — | — | W 11 | — | W 10 | W 10 | — | W 10 | W 10 | W 9 | W 9 | WNW 6 | E 3 | W 8 | WNW 4 | W 6 | NW 8 |
| kJ | 2 | — | — | — | — | 2 | — | 8 | 19 | — | 17 | 16 | 15 | 15 | 3 | 1 | 6 | 1 | 3 | 18 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | NW 7 | — | — | NW 6 | NW 10 | W 9 | WNW 3 | W 8 | W 8 | W 8 |
| kJ | — | — | — | — | — | — | — | — | — | — | 12 | — | — | 1 | 4 | 6 | 1 | 5 | 1 | 1 |
Wind waves Height (m) Direction Period (s) | WNW 2 | WNW 3 | — | WSW 7 | WSW 7 | W 7 | W 8 | WNW 7 | — | WNW 7 | NNE 4 | NE 3 | — | NE 3 | ENE 4 | — | NNE 2 | NNE 3 | WNW 3 | NNE 4 |
| kJ | 1 | 4 | — | 143 | 121 | 124 | 217 | 193 | — | 47 | 8 | 2 | — | 7 | 7 | — | 1 | 2 | 3 | 7 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 356 | 101 | 101 | 101 | 44 | 90 | 158 | 35 | 87 | 436 | 32 | 277 | 173 | 335 | 139 | 90 | 101 | 101 | 101 | 122 |
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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