Surf Forecasts:
Belle Ile - Les Donnants surf forecast from 10 Sep 2026:
- Best quality surf: Monday 14 Sep, 2AM (local time) - 3.5ft (1.0m), 10s period, WNW swell with cross-offshore winds.
- Most powerful swell: Wednesday 16 Sep, 8PM (local time) - 6ft (1.8m), 10s period, WNW swell with 625 kJ wave energy.
- Next surfable swell (1★+): Saturday 12 Sep, 8AM (local time) - 3ft (0.9m), 8s 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 Saturday (Sep 12) at 8AM. The primary swell is predicted to be 0.9m and 8s period with a secondary swell of 0.1m and 18s. The wind is predicted to be offshore as the swell arrives.
The most powerful waves expected at Belle Ile - Les Donnants in the next 16 days are 1.8m 10s and forecast to arrive on Wednesday (Sep 16) at 8PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.4m 3s period and expected on Wednesday (Sep 16) at 11PM.
| Wave Type | Time (CEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 8AM (Sat 12th Sep) | 3ft (0.9m) 8s |
| Best Surf | 2AM (Mon 14th Sep) | 3.5ft (1.0m) 10s |
| Most Powerful | 8PM (Wed 16th Sep) | 6ft (1.8m) 10s |
Table - best surf conditions forecast for Belle Ile - Les Donnants over the next 16 days.
The Lowdown
Alright, Rusty here. Let’s break down what’s cookin’ for Belle Ile - Les Donnants.
Lookin’ at the full 16 days, there’s some real quiet patches and only a few windows worth paddlin’ for. Water temp is 67°, which is a touch warmer than normal for this time of year, so you’ll be alright in a shorty.
Don’t bother with the 10th – it’s a poor 0.5ft WNW slop (combined energy 64). 11th sees a small bump to 1ft WNW, but the onshore wind ruins it. The first real chance comes Saturday the 12th morning: 0.9ft of W swell with a light ESE cross-offshore breeze. Combined energy is only 109, so it’s weak, but it’s clean. That’s your best early window.
Sunday the 13th and Monday the 14th morning are the next decent look. The 14th has a clean 0.9ft WNW swell with an ESE offshore wind at 15 mph (combined energy 184). It’s small but rideable.
Then we hit a nasty dry spell. From the 15th through the 22nd it’s mostly onshore crap or blown out slop. The 16th sees a 2ft WNW swell (combined energy 585) but it’s cross-onshore and howlin’ – that’s kite surf territory, not a paddle board. The 18th has a 0.5ft groundswell with a 13-second period, but combined energy is only 159; too weak to get excited about.
Everything from the 19th to the 22nd is plain ugly.
The first real standout is Wednesday the 23rd of September morning. Clean, 1.0ft WNW groundswell with a 14-second period and a solid 515 combined energy. The NE wind at 25 mph is cross-offshore, so it should be clean. That long period might make it close out a bit on the beach, but it’s got proper energy.
The absolute best of the run is Thursday the 24th of September morning. We’ve got 1ft of WNW swell (combined energy 332) with a 12-second period and a clean ENE offshore at 15 mph. That’s a good combo – clean, fun, and with enough push. Friday the 25th afternoon goes glassy with a tiny 0.9ft swell, so if you’re after a real cruisy session, that’s your go.
Crowds are ‘often’ here, so the good days will have company. To sum it up: a big gap from the 15th to the 22nd, then Wednesday the 23rd and especially Thursday the 24th of September are your best shots.
Rusty.
Short Range ForecastMostly dry. Very mild (max 19°C on Fri afternoon, min 17°C on Thu night). Wind will be generally light. | Days 5-7 Weather SummaryMostly dry. Warm (max 24°C on Mon night, min 16°C on Tue night). Winds increasing (calm on Mon night, strong winds from the WNW by Tue afternoon). | |||||||||||||||||||
Thu 10 | Friday 11 | Saturday 12 | Sunday 13 | Monday 14 | Tuesday 15 | Wednesday 16 | ||||||||||||||
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) | WNW 8 | W 8 | WNW 10 | W 9 | W 8 | W 8 | WNW 8 | WNW 10 | WNW 11 | WNW 11 | WNW 10 | WNW 10 | W 9 | W 9 | W 8 | WNW 6 | WNW 8 | WNW 9 | WNW 10 | WNW 10 |
Wave Graph  | ||||||||||||||||||||
 kJ | 41 | 42 | 288 | 240 | 143 | 103 | 112 | 160 | 314 | 308 | 218 | 154 | 106 | 78 | 50 | 160 | 414 | 585 | 579 | 564 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | on | on | on | cross-on | cross-off | on | cross | cross-on | on | cross-off | off | cross-off | cross-off | on | cross-on | cross-on | cross-on | on | cross |
High Tide | 5:11PM4.44m | 5:34AM4.23m | 5:49PM4.55m | 6:09AM4.31m | 6:23PM4.52m | 6:41AM4.28m | 6:55PM4.39m | 7:11AM4.18m | 7:26PM4.16m | 7:40AM4.00m | 7:56PM3.87m | 8:10AM3.76m | 8:27PM3.55m | |||||||
Low Tide | 11:17PM-0.07m | 11:30AM-0.02m | 11:56PM-0.16m | 12:09PM-0.09m | 00:32AM-0.12m | 12:46PM-0.04m | 1:08AM0.03m | 1:23PM0.13m | 1:43AM0.28m | 2:00PM0.38m | 2:18AM0.60m | 2:39PM0.70m | 2:56AM0.94m | |||||||
 |  |  | |  | | | | | | | | | | | | | | | | |
 | — | — | 7:43 | — | — | 7:45 | — | — | 7:46 | — | — | 7:48 | — | — | 7:48 | — | — | 7:50 | — | — |
 | 8:36 | — | — | 8:34 | — | — | 8:31 | — | — | 8:30 | — | — | 8:28 | — | — | 8:25 | — | — | 8:23 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 18 | 18 | 18 | 19 | 19 | 17 | 18 | 19 | 18 | 20 | 23 | 19 | 22 | 24 | 20 | 19 | 17 | 16 | 19 | 20 |
Feels °C | 15 | 16 | 16 | 18 | 17 | 17 | 19 | 17 | 17 | 18 | 21 | 18 | 22 | 25 | 19 | 13 | 9 | 11 | 13 | 14 |
Swell 1 Height (m) Direction Period (s) | WNW 8 | W 8 | WNW 10 | W 9 | W 8 | W 8 | WNW 8 | WNW 10 | WNW 11 | WNW 11 | WNW 10 | WNW 10 | W 9 | W 9 | W 8 | — | W 11 | WNW 9 | — | WNW 10 |
| kJ | 41 | 42 | 288 | 240 | 143 | 103 | 112 | 160 | 314 | 308 | 218 | 154 | 106 | 78 | 50 | — | 59 | 585 | — | 564 |
Swell 2 Height (m) Direction Period (s) | WSW 8 | WNW 8 | — | — | — | W 17 | WNW 15 | WNW 13 | — | — | NW 4 | NW 11 | NW 10 | WNW 10 | WNW 12 | — | — | — | — | — |
| kJ | 19 | 26 | — | — | — | 6 | 44 | 95 | — | — | 7 | 30 | 25 | 9 | 29 | — | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | W 12 | WNW 11 | — | — | — | — | NW 10 | — | — | — | — | — | E 3 | W 14 | W 12 | — | — | — | — | — |
| kJ | 3 | 23 | — | — | — | — | 27 | — | — | — | — | — | 1 | 4 | 11 | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | WSW 2 | — | — | — | — | — | — | NW 3 | — | — | — | — | — | — | SW 3 | WNW 6 | WNW 8 | — | WNW 10 | NNE 3 |
| kJ | 1 | — | — | — | — | — | — | 1 | — | — | — | — | — | — | 3 | 160 | 414 | — | 579 | 3 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 101 | 43 | 44 | 158 | 20 | 0 | 101 | 28 | 36 | 90 | 0 | 0 | 0 | 0 | 242 | 931 | 44 | 44 | 44 | 35 |
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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