Surf Forecasts:
Belle Ile - Les Donnants surf forecast from 31 Aug 2026:
- Best quality surf: Saturday 5 Sep, 11AM (local time) - 4.5ft (1.4m), 12s period, WNW swell with cross-offshore winds.
- Most powerful swell: Monday 31 Aug, 8AM (local time) - 8ft (2.5m), 10s period, W swell with 1,373 kJ wave energy.
- Next surfable swell (1★+): Tuesday 1 Sep, 5AM (local time) - 5ft (1.6m), 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 1.6m 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 0.9m 4s 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 (1.6m) 10s |
| Best Surf | 11AM (Sat 5th Sep) | 4.5ft (1.4m) 12s |
| 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 crew, Rusty here. Let’s break down what’s cookin’ at Belle Ile - Les Donnants for the next couple of weeks. Things start ugly, but there’s a couple of windows if you’re patient.
Right now, Monday August 31st is a total loss. There’s a 8ft west swell, but it’s gettin’ smashed by 25 km/h onshore wind. The water’s at 67°, which is pretty standard for this time of year, but the surf is just a roiled-up mess.
First thing worth paddlin’ out for is Tuesday morning September 1st. Swell drops to 4ft from the west, and the wind goes cross-offshore from the ENE at just 5 km/h. That’s clean, glassy conditions with a moderate combined energy (306). It’s a consistent spot, and this west swell suits its optimum direction right down the line. Not a classic, but a solid little session.
Wednesday the 2nd through Friday the 4th turn quiet – small and onshore. Skip it.
The real standout is Saturday morning September 5th. We’ve got a 5ft west-northwest groundswell with a very long 12-second period. The wind is a beautiful cross-offshore from the northeast at 15 km/h. Combined energy is a strong 575, so those sets will have some push. Because of that long period, the wave might run a bit straight on the beach, but this is a river mouth spot – ideal for that sort of swell. It’ll be clean, packed with energy, and offer some proper waves. The morning is the sweet spot, as the afternoon wind turns a bit soft onshore.
Next up, Tuesday morning September 8th is another quality window. There’s 5ft of west swell with an 11-second period, and the wind is offshore from the east-northeast at 15 km/h. That’s gentle and clean with strong energy (590). This size (over 5ft) is really for the experienced crew, but if you’re dialed in at the river, it’ll be a beauty session. The afternoon wind turns onshore, so again, be an early bird.
The rest of the second week is a real snoozer. From Wednesday the 9th through Sunday the 14th, it’s onshore winds, chop, and tiny swell – mostly under 2ft. There’s a moment on Saturday the 12th with a 3ft groundswell and a fresh 30 km/h offshore breeze, but the period is short (9 seconds) and the energy is weak (184). Not worth it.
We close out Monday the 15th of September with rideable but very ordinary 2ft west swell at 11 seconds and light cross-off wind. Small, clean, but nothing to get excited about.
So the bottom line: the standouts are Saturday morning September 5th and Tuesday morning September 8th. That’s your two real looks. The rest is mostly flat and blown.
Catch ya in the water,
Rusty
Short Range ForecastMostly dry. Very mild (max 18°C on Mon morning, min 15°C on Tue morning). Winds decreasing (fresh winds from the W on Mon morning, calm by Tue afternoon). | Days 4-6 Weather SummaryMostly dry. Warm (max 21°C on Fri afternoon, min 14°C on Sat morning). Mainly fresh winds. | ||||||||||||||||||||
Monday 31 | Tuesday 1 | Wednesday 2 | Thursday 3 | Friday 4 | Saturday 5 | Sunday 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) | W 10 | W 10 | W 10 | W 10 | W 9 | W 9 | W 8 | W 8 | WNW 8 | W 8 | W 8 | W 8 | WNW 9 | W 9 | WNW 10 | WNW 12 | WNW 13 | WNW 11 | WNW 10 | WNW 10 | W 9 |
Wave Graph  | |||||||||||||||||||||
 kJ | 1201 | 951 | 573 | 306 | 165 | 99 | 48 | 33 | 151 | 161 | 131 | 137 | 169 | 162 | 373 | 575 | 506 | 349 | 149 | 100 | 24 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | on | cross | cross-off | on | cross | on | on | on | on | on | on | on | on | cross | cross-off | on | cross-off | off | glassy | cross-off |
High Tide | 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 | 1:15PM3.22m | 2:15AM3.19m | ||||||||
Low Tide | 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 | 6:41AM1.29m | 7:33PM1.10m | ||||||||
 | |  |  | | | | |  | | | | | | | | | | | | | |
 | 7:28 | — | — | 7:31 | — | — | 7:31 | — | — | 7:33 | — | — | 7:33 | — | — | 7:35 | — | — | 7:37 | — | — |
 | — | 8:55 | — | — | 8:53 | — | — | 8:52 | — | — | 8:50 | — | — | 8:47 | — | — | 8:45 | — | — | 8:44 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 18 | 18 | 18 | 15 | 17 | 17 | 17 | 18 | 18 | 19 | 19 | 19 | 20 | 21 | 20 | 15 | 19 | 19 | 15 | 24 | 25 |
Feels °C | 13 | 14 | 14 | 14 | 16 | 14 | 17 | 16 | 16 | 19 | 19 | 18 | 20 | 20 | 18 | 13 | 17 | 15 | 8 | 22 | 20 |
Swell 1 Height (m) Direction Period (s) | W 10 | W 10 | W 10 | W 10 | W 9 | W 9 | W 8 | W 8 | WNW 8 | W 8 | W 8 | W 8 | WNW 9 | WNW 11 | WNW 10 | WNW 12 | WNW 13 | WNW 11 | WNW 10 | WNW 10 | W 9 |
| kJ | 1201 | 951 | 573 | 306 | 165 | 99 | 48 | 33 | 151 | 161 | 131 | 137 | 169 | 91 | 373 | 575 | 506 | 349 | 149 | 100 | 24 |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | — | NNW 3 | — | — | — | — | — | WNW 11 | WNW 11 | WNW 12 | — | — | — | — | — | NW 9 |
| kJ | — | — | — | — | — | — | 1 | — | — | — | — | — | 69 | 12 | 104 | — | — | — | — | — | 21 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | W 18 |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 6 |
Wind waves Height (m) Direction Period (s) | — | W 10 | — | — | — | NW 3 | — | — | — | — | — | — | — | W 9 | — | NNE 3 | — | ENE 3 | E 4 | ESE 4 | ESE 4 |
| kJ | — | 710 | — | — | — | 3 | — | — | — | — | — | — | — | 162 | — | 2 | — | 7 | 22 | 7 | 15 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 158 | 93 | 28 | 0 | 90 | 28 | 156 | 101 | 101 | 101 | 101 | 116 | 136 | 90 | 30 | 0 | 44 | 30 | 101 | 0 | 0 |
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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