Surf Forecasts:
Belle Ile - Les Donnants surf forecast from 20 Jul 2026:
- Most powerful swell: Monday 27 Jul, 5PM (local time) - 5.5ft (1.7m), 9s period, WNW swell with 427 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 1.7m 9s and forecast to arrive on Monday (Jul 27) at 5PM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.2m 5s period and expected on Monday (Jul 20) at 11PM.
| Wave Type | Time (CEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 5PM (Mon 27th Jul) | 5.5ft (1.7m) 9s |
Table - best surf conditions forecast for Belle Ile - Les Donnants over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s take a look at what’s coming up for Belle Ile - Les Donnants. It's a river mouth break, exposed to the SW, so it needs a good swell from that direction to really fire. The water’s sitting at 72° right now, which is much warmer than normal for this time of year – that’s a bit of a treat if you’re getting in.
First things first, the next week or so is pretty flat. We’re looking at tiny waves, mostly under 1ft, with poor conditions right through until the end of July. The wind is often cross or onshore, and the energy is just not there. It’s a real bummer, but that’s how it goes sometimes.
The first real flicker of something happens later on. On the morning of Tuesday, 4th August, we get a bit of a pulse. The swell picks up to 5ft from the west, with a period of 7 seconds. The combined energy hits 209 (moderate), and the wind is light and cross-offshore from the SSE. That’s clean. The forecast says "expect good surf conditions" there. It’s not a monster, but after all that flatness, it’s the standout. The break is consistent, so it should be working. Keep in mind it’s a river mouth, so a bit of current might be around. The morning of the 4th is your window.
After that, the afternoon of the 4th gets messy with onshore wind, and the following days look poor again. So, if you’re keen, mark that Tuesday morning, 4th August, in your calendar. It’s not pumping, but it’s the best we’ve got.
Rusty.
Short Range ForecastMostly dry. Warm (max 27°C on Thu afternoon, min 16°C on Tue morning). Winds decreasing (strong winds from the NNE on Mon night, calm by Wed afternoon). | Days 5-7 Weather SummaryLight rain (total 7mm), mostly falling on Sat night. Warm (max 27°C on Thu night, min 18°C on Sat night). Winds increasing (light winds from the SE on Fri afternoon, strong winds from the WNW by Sat night). | ||||||||||||||||||
Tuesday 21 | Wednesday 22 | Thursday 23 | Friday 24 | Saturday 25 | Sunday 26 | ||||||||||||||
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 11 | WNW 11 | WNW 10 | WNW 10 | WNW 10 | WNW 10 | W 9 | W 9 | W 9 | W 9 | W 9 | SE 5 | W 8 | W 8 | WNW 5 | WNW 6 | WNW 6 | WNW 6 | WNW 6 |
Wave Graph  | |||||||||||||||||||
 kJ | 12 | 22 | 20 | 19 | 19 | 18 | 16 | 14 | 14 | 6 | 6 | 11 | 7 | 5 | 100 | 87 | 65 | 154 | 150 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | cross | cross-off | off | on | cross-off | off | cross-on | off | off | on | cross-off | cross-on | on | on | cross-on | on | cross-on |
High Tide | 10:06PM3.59m | 10:33AM3.31m | 10:56PM3.29m | 11:29AM3.12m | 00:00AM3.04m | 12:43PM3.01m | 1:25AM2.93m | 2:05PM3.03m | 2:44AM2.98m | 3:11PM3.16m | 3:41AM3.12m | 4:00PM3.35m | 4:24AM3.30m | ||||||
Low Tide | 4:29AM0.83m | 4:50PM1.01m | 5:21AM1.10m | 5:49PM1.23m | 6:20AM1.30m | 6:56PM1.36m | 7:26AM1.39m | 8:05PM1.36m | 8:31AM1.34m | 9:07PM1.24m | 9:28AM1.20m | 10:00PM1.05m | |||||||
 | | |  | | | | | | | | |  |  | |  |  | | | |
 | — | 6:37 | — | — | 6:37 | — | — | 6:39 | — | — | 6:39 | — | — | 6:41 | — | — | 6:43 | — | — |
 | 10:00 | — | — | 10:00 | — | — | 9:59 | — | — | 9:58 | — | — | 9:57 | — | — | 9:55 | — | — | 9:54 |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 3 | 4 | — | — |
Temp °C | 24 | 19 | 26 | 25 | 19 | 26 | 25 | 20 | 27 | 27 | 21 | 26 | 26 | 21 | 22 | 20 | 19 | 20 | 22 |
Feels °C | 16 | 12 | 23 | 18 | 15 | 21 | 20 | 15 | 25 | 23 | 17 | 22 | 21 | 18 | 17 | 12 | 15 | 14 | 15 |
Swell 1 Height (m) Direction Period (s) | WNW 11 | WNW 11 | WNW 10 | WNW 10 | WNW 10 | WNW 10 | WNW 5 | W 9 | ESE 3 | NW 3 | W 9 | SE 5 | W 8 | W 8 | — | WNW 10 | WNW 11 | W 6 | WNW 9 |
| kJ | 12 | 22 | 20 | 19 | 19 | 18 | 9 | 14 | 2 | 3 | 6 | 11 | 5 | 5 | — | 10 | 12 | 1 | 70 |
Swell 2 Height (m) Direction Period (s) | W 8 | NW 5 | SE 4 | WNW 6 | NW 5 | ESE 4 | W 9 | NW 5 | W 9 | W 9 | — | W 8 | SE 4 | NW 10 | — | W 13 | W 10 | — | SW 5 |
| kJ | 1 | 1 | 1 | 3 | 1 | 2 | 16 | 1 | 14 | 6 | — | 6 | 1 | 4 | — | 3 | 8 | — | 4 |
Swell 3 Height (m) Direction Period (s) | W 8 | W 8 | NW 6 | — | NW 5 | — | — | — | NW 6 | W 6 | — | W 6 | — | — | — | — | — | — | — |
| kJ | 1 | 1 | 1 | — | 1 | — | — | — | 1 | 1 | — | 1 | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | NNE 5 | ENE 4 | ENE 4 | NE 4 | ENE 4 | — | NE 3 | E 4 | — | ENE 3 | ESE 4 | — | NNW 3 | N 3 | WNW 5 | WNW 6 | WNW 6 | WNW 6 | WNW 6 |
| kJ | 56 | 31 | 5 | 36 | 17 | — | 6 | 9 | — | 3 | 7 | — | 7 | 1 | 100 | 87 | 65 | 154 | 150 |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 356 | 377 | 139 | 407 | 346 | 139 | 436 | 347 | 374 | 356 | 377 | 574 | 742 | 453 | 563 | 435 | 451 | 90 | 781 |
Best forecast wave conditions in Morbihan - Brittany | |||||||||||||||||||
Best forecast wave conditions in France | |||||||||||||||||||
Header Global | |||||||||||||||||||
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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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