Surf Forecasts:
Belle Ile - Les Donnants surf forecast from 1 Sep 2026:
- Best quality surf: Tuesday 8 Sep, 2AM (local time) - 5ft (1.5m), 10s period, W swell with cross-offshore winds.
- Most powerful swell: Tuesday 8 Sep, 2AM (local time) - 5ft (1.5m), 10s period, W swell with 467 kJ wave energy.
- Next surfable swell (1★+): Tuesday 1 Sep, 11AM (local time) - 4.5ft (1.3m), 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 11AM. The primary swell is predicted to be 1.3m 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 1.5m 10s and forecast to arrive on Tuesday (Sep 08) at 2AM. Winds are predicted to be cross-offshore 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 11AM.
| Wave Type | Time (CEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 11AM (Tue 1st Sep) | 4.5ft (1.3m) 10s |
| Best Surf | 2AM (Tue 8th Sep) | 5ft (1.5m) 10s |
| Most Powerful | 2AM (Tue 8th Sep) | 5ft (1.5m) 10s |
Table - best surf conditions forecast for Belle Ile - Les Donnants over the next 16 days.
The Lowdown
Right then, grab your wettie, it’s Rusty here. Let’s have a proper look at what Belle Ile - Les Donnants is serving up.
Honestly, the next couple of weeks are a bit of a head-scratcher. We’ve got a real mixed bag with plenty of onshore and cross-onshore wind messing things up, and most days the surf quality just isn't there. The few moments where the wind swings offshore are let down by tiny swell, or the bigger pulses are ruined by the wrong wind direction or choppy conditions. The one bright spot? Tuesday the 1st of September. That’s your window.
The water temp is sitting at about average for the time of year, so no wetsuit worries there. Expect a combined swell energy of 306 (moderate) moving through.
Tuesday the 1st is the standout. The morning is where it’s at: a clean, 4ft swell from the West with a 10-second period, and a light offshore breeze from the NE. That’s real clean surf for Belle Ile - Les Donnants. The afternoon turns onshore from the West and drops to 3ft, so the morning session is the one to chase. Conditions will be smooth and the wave shape should be decent, though keep an eye out as this spot can get crowded sometimes.
After that, it gets grim. From Wednesday the 2nd through to Monday the 7th, the size drops right off and the wind is either onshore or cross-onshore. Expect waist-high slop or smaller, mostly blown out. There’s a glimmer on Saturday the 5th morning with a cross-offshore breeze from the ENE on a 3ft, 10-second west-northwest swell giving a combined energy of 270 (moderate), but it’s only rated as marginal.
Monday the 7th afternoon looks bigger with a 3ft, 12-second long-period West swell pushing the combined energy to 380 (moderate), but it’s straight onshore from the West – a mess.
Tuesday the 8th and Wednesday the 9th see a push of 4ft to 6ft west-northwest swell, with combined energy between 576 and 584, so there’s serious grunt in the water. But the wind stays cross-onshore. That’s proper messy and choppy, not good for a paddle board. Honestly, with that much wind and swell, that setup looks far more interesting for kite surfing.
The second week is patchy. A few mornings, like Friday the 11th and Saturday the 12th, offer a clean, cross-offshore breeze on 4ft to 6ft west-northwest swell with combined energy around 315-394, but they are only rated as marginal. Tuesday the 15th morning has a clean cross-offshore breeze and a nice long 12-second period on a 3ft West swell (combined energy 278), which sounds promising but it’s still only marginal.
To be honest, if you're after a surf, aim for Tuesday the 1st morning. Everything else is pretty ordinary, and the bigger swells later on are wasted with the wind. A bit of a blank run for the area, but it never stays poor forever.
Rusty.
Short Range ForecastMostly dry. Very mild (max 19°C on Wed night, min 15°C on Tue morning). Wind will be generally light. | Days 4-6 Weather SummarySome drizzle, heaviest during Sun night. Warm (max 27°C on Sun night, min 15°C on Fri night). Winds decreasing (fresh winds from the ENE on Sat night, calm by Sun night). | ||||||||||||||||||||
Tuesday 1 | Wednesday 2 | Thursday 3 | Friday 4 | Saturday 5 | Sunday 6 | Monday 7 | |||||||||||||||
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 9 | W 9 | W 8 | W 8 | WNW 8 | W 8 | W 8 | W 8 | WNW 8 | W 8 | WNW 9 | WNW 10 | WNW 11 | WNW 10 | WNW 10 | WNW 10 | WNW 8 | WSW 7 | W 12 | W 10 |
Wave Graph  | |||||||||||||||||||||
 kJ | 306 | 165 | 76 | 48 | 33 | 77 | 118 | 98 | 103 | 120 | 144 | 162 | 201 | 176 | 187 | 68 | 72 | 24 | 143 | 276 | 467 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | on | cross | on | on | on | cross-on | on | on | cross-on | on | cross-off | cross-off | cross-on | cross-off | off | off | cross-off | cross-on | on | cross-off |
High Tide | 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 | 2:44PM3.51m | 3:24AM3.49m | ||||||||
Low Tide | 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 | 8:05AM1.12m | 8:49PM0.81m | ||||||||
 |  |  | | |  | | | | | | | | | | | |  | | | | |
 | 7:31 | — | — | 7:31 | — | — | 7:33 | — | — | 7:33 | — | — | 7:35 | — | — | 7:37 | — | — | 7:37 | — | — |
 | — | 8:53 | — | — | 8:52 | — | — | 8:50 | — | — | 8:47 | — | — | 8:45 | — | — | 8:44 | — | — | 8:42 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | — | — | — |
Temp °C | 15 | 17 | 17 | 16 | 18 | 19 | 18 | 19 | 19 | 19 | 20 | 21 | 16 | 22 | 23 | 18 | 25 | 27 | 22 | 25 | 25 |
Feels °C | 14 | 15 | 15 | 15 | 16 | 18 | 18 | 19 | 19 | 18 | 18 | 19 | 13 | 19 | 18 | 11 | 21 | 25 | 17 | 20 | 20 |
Swell 1 Height (m) Direction Period (s) | W 10 | W 9 | W 9 | W 8 | W 8 | WNW 8 | W 8 | W 8 | W 8 | WNW 8 | W 8 | WNW 9 | WNW 10 | WNW 11 | WNW 10 | WNW 10 | WNW 10 | WNW 8 | W 13 | W 12 | W 10 |
| kJ | 306 | 165 | 76 | 48 | 33 | 77 | 118 | 98 | 103 | 120 | 144 | 162 | 201 | 176 | 187 | 68 | 72 | 24 | 87 | 276 | 467 |
Swell 2 Height (m) Direction Period (s) | — | — | NW 3 | — | — | — | NW 9 | NW 8 | — | — | W 13 | NW 11 | NW 10 | W 9 | — | W 9 | SE 4 | WNW 9 | WNW 8 | — | W 10 |
| kJ | — | — | 4 | — | — | — | 3 | 3 | — | — | 3 | 30 | 24 | 25 | — | 41 | 7 | 8 | 24 | — | 165 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | WNW 12 | — | — | — | ENE 3 | SE 4 | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | 45 | — | — | — | 1 | 1 | — | — | — |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | WNW 3 | NNE 2 | ENE 3 | — | ENE 4 | E 4 | — | SW 3 | WSW 7 | W 6 | — |
| kJ | — | — | — | — | — | — | — | — | — | — | 2 | 1 | 3 | — | 13 | 27 | — | 2 | 143 | 104 | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 93 | 20 | 156 | 436 | 121 | 90 | 90 | 43 | 36 | 158 | 36 | 20 | 31 | 28 | 30 | 0 | 90 | 36 | 90 | 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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